18

　　come about发生；产生；改变方向

　　多维训练

　　(1)单句语法填空

　　①—What on earth are the police busy with?

　　—They have been looking into how the plane crash came about.

　　②How does it come about that you were caught by the police?

　　(2)短语填空

　　come up with，come across，when it comes to

　　①The meaning of this word will come across to you sooner or later.

　　②When it comes to diet and exercise，we know what to do，but we don’t do what we know.

　　③To some extent，what you came up with is practical.

　　19

　　No sooner had they moved in than the noise began and rarely did they get a full night’s sleep.他们刚一搬进去噪音就开始了，而且他们几乎没有睡过一个囫囵觉。

　　句型公式：no sooner...than...

　　(1)no sooner...than...表示“一……就……；刚……就……”，主句常用过去完成时，than从句中常用一般过去时。当no sooner位于句首时，主句用部分倒装。

　　(2)类似句型：hardly/scarcely...when...意思是“一……就……；刚……就……”，主句常用过去完成时，when引导的从句常用一般过去时。当hardly/scarcely位于句首时，主句用部分倒装。

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