题目

The fact has worried many scientists _____ the earth is becoming warmer and warmer these years. A. what     B. which     C. that     D. though   答案： C   句意: 近年来全球气候不断变暖, 这一事实使得很多科学家感到担忧。本题考查同位语从句。该题同位语从句结构完整, 故选连词that。

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