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英语
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Only a small part of the energy of the sun___by man so far.
A.has been used
B.was used
C.has used
D.will be used
属于什么语法时态?
人气:402 ℃ 时间:2020-04-08 08:32:23
解答
选A,only位于句首产生倒装,so far 可以看出用完成时,太阳能是被利用的,所以用被动语态,综合来看是现在完成式的被动语态.
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