题目

“How long do you suppose it is _______ he left for Japan?” “No more than half a month.” A. when                      B. before C. after                     D. since   答案： D 问句的基本结构是“It is +时间段+since 从句”，其原句型是 I suppose it is no more than half a month since he left for Japan. 假若对此句中的 no more than half a month 提问，则可得到提问句。

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