UC知道____ different kinds of ferilizers,the workers further improved their technique.
来源：百度知道 编辑：UC知道 时间：2024/06/15 21:43:13
a. Having been produced b.Being produced
C. Having produced D.producing
为什么选c
C. Having produced D.producing
为什么选c
c吧.因为produce different kinds of ferilizers 的主语是the workers .用现在完成时,是因为它对improved their technique这个结果了产生影响.
A
表示结果 因为是被动关系 所以选A
．．．．．．．．．．．．．．．．．．．．．．．．
我是这么认为的
主语与主句一样,并且表示已完成,所以选C
____ different kinds of ferilizers,the workers further improved their technique.
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