一道英语题
1.Mr.Smith does not know____the lawn mower after they had finished using it. A.where they did put B.where to put C.where did they put D.where they put 为什么选D不选B
如果选就B变成是Mr.Smith不知道把lawn mower放在哪里，而不是他不知道他们用完后放在哪里,疑问代词加不定式的主语是和主句一致的
也许是Ｂ吧！
选择D主要还是因为after they had finished using it是过去完成时，前面过去时的主语应该与此从句主语一致，即也应该是THEY才能表达过去完成时的“动作结果产生的影响”。我不知各位听明白了没有，反正语法这东西很多靠的是语感，言传不如意会。
I agree with 呵呵.
如果是：the place where to put就对了。where 不能跟 to
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