最新四级考试词汇课堂笔记精讲20_大学英语单词

　　42. 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。

　　45. 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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