A．If ever

　　B．If busy

　　C．If anything

　　D．If possible

　　18．（2017·四川成都外国语学校月考）Having an outdoor meal is always fun，but it can also be damaging to the planet if ______.

　　A．planned not carefully

　　B．not planning carefully

　　C．not planned carefully

　　D．not to be planned carefully

　　19．Why was ______ that the old woman was sent to prison?A．he

　　B．it

　　C． that

　　D．what20．（2017·江西师大附中英语月考）Mr Green didn't understand ______made his daughter so absent­minded this morning.

　　A．how that was

　　B．what was it

　　C．why it was that

　　D．what it was that

　　21．（2017·云南玉溪一中英语月考）I would have paid a visit to you ______ possible.

　　A．if it were

　　B．would it be

　　C．had it been

　　D．should it have been

　　1．D　从句意的连贯看，本空所在问句是强调句的一般疑问句，陈述句的表达是It was by cutting down staff that she saved the firm.（她通过裁减员工挽救了公司）因此本空选D项。

　　2．B　强调的是时间状语，故用that来引导。句意：是在克里斯托弗·哥伦布横渡大西洋80年前，郑和就已经航海到了非洲东部。故选B项。

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