40. Had he worked harder, he _D_ the exams.
A must have got through B could get through
C would get through D would have got through
had he worked harder = if he had worked harder
与过去事实相反用:情态动词 + have + 动词的过去分词。
41. It seems oil _B_ from this pipe for some time. We ll have to take the machine apart to put it right.
A had leaked B has been leaking C leaked D is leaking
for + 一段时间,做时间状语,谓语动词用完成时态。过去完成时要与一般过去时搭配。
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