| 1. 单选题 | 详细信息 |
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If you miss this chance, it may be years ____ you get another one.
A . As
B . before
C . since
D . after
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| 2. 单选题 | 详细信息 |
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______ scientists have learned a lot about the universe, there is much we still don't know.
A . Once
B . Since
C . Though
D . Unless
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| 3. 单选题 | 详细信息 |
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A ship in harbor is safe, but that's not ______ ships are built for.
A . what
B . whom
C . why
D . when
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| 4. 单选题 | 详细信息 |
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________ the job takes a significant amount of time, most students agree that the experience is worth it.
A . If only
B . After
C . Although
D . In case
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| 5. 单选题 | 详细信息 |
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I believe you will have a wonderful time here _______ you get to know everyone else.
A . though
B . as if
C . once
D . so that
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| 6. 单选题 | 详细信息 |
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If you swim in a river or lake, be sure to investigate is below the water surface. Often there are rocks or branched hidden in the water.
A . what
B . who
C . that
D . whoever
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| 7. 单选题 | 详细信息 |
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__ a single word can change the meaning of a sentence, a single sentence can change the meaning of a paragraph.
A . Just as
B . Even though
C . Until
D . Unless
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| 8. 单选题 | 详细信息 |
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We need to get to the root of the problem______ we can solve it.
A . while
B . after
C . before
D . as
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| 9. 单选题 | 详细信息 |
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There is only one more day to go _____ your favorite music group play live.
A . since
B . until
C . when
D . before
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| 10. 单选题 | 详细信息 |
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You won’t find paper cutting difficult _____you keep practicing it.
A . even if
B . as long as
C . as if
D . ever since
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