题目内容
The scientists did all they _______ make the experiment a Success.
[ ]
A.could
B.can
C.could to
D.can to
答案:C
解析:
解析:
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首先,根据题意排除掉 B、D两项,因为本题表述的是过去的事情。再者,此处考查的是do all sb. can to do这一句型。 |
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