C.am just to help D.have just helped
【答案】 B
【解析】考查时态。从“我不是我们班的班长”可知,后边的句子意思为“我只是暂时帮老师的忙直到班长被选出”。根据句意,此处表示现阶段正在进行的动作,应该用现在进行时。
16、With the country's population reaching 1.6 billion in the mid of this century, most of China's rivers, including the Yellow River, ____.
A.is drying up B.will be drying up
C.dry up D.have dried up
【答案】B
【解析】考查时态。根据句中的时间状语 in the mid of this century 再结合语意可知本题应该使用将来进行时表示在将来某一段时间内发生的变化。
17、—Did you find the missing couple in the mountain yesterday?
—No, but we ____ to get in touch with them ever since.
A.have tried B.have been trying
C.had tried D.had been trying
【答案】B
19、Please do me a favor —____ my friend Mr. Smith to Youth Theater at 7:30 tonight.
A.to invite B.inviting
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