英语动词时态语态··达人进~in the past few years , many scientists_______
英语动词时态语态··达人进~
in the past few years , many scientists_______ to find out why they failed in forecasting earthquakes
A.were trying
B. have been tried
C. have been trying
D . are trying
详解,谢
in the past few years , many scientists_______ to find out why they failed in forecasting earthquakes
A.were trying
B. have been tried
C. have been trying
D . are trying
详解,谢
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C.
in the past few years 意思是“在过去的几年里”,应该是从几年前开始一直到现在,故应该用完成时,（B项是被动语态.）have been trying是现在完成进行时,表示从过去某一时刻开始持续到现在并可能还要进行下去的动作.
in the past few years 意思是“在过去的几年里”,应该是从几年前开始一直到现在,故应该用完成时,（B项是被动语态.）have been trying是现在完成进行时,表示从过去某一时刻开始持续到现在并可能还要进行下去的动作.
1年前
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