2017届高考英语二轮热点复习专题训练：语法单选题系列23_高考复习指南

　　语法单选题系列23

　　1．—Do you think the weather will be all right this summer?

　　—No, _____ we are lucky. The newspaper says it'll be very hot anyway.

　　A. if

　　B. though

　　C. unless

　　D. as

　　【答案】C

　　【解析】连词辨析。Unless=if…not除非，如不；no代替一个否定句。结合句意可知C正确。句意：—你认为今年夏天的天气会好吗？—如果我们运气不好，今年夏天的天气会很不好。报纸上说将会很热。

　　2．You may ______ it that Jennifer will come and help us if we are in trouble.

　　A. base on

　　B. rely on

　　C. carry on

　　D. hold on

　　【答案】B

　　【解析】短语辨析。A以…为基础；B依赖，相信；C进行；D坚持，别挂断。结合句意可知B正确。句意：你可以相信如果我们遇见麻烦Jennifer会来帮我们。

　　3．Not until he left his home ______ to know how important the family was for him.

　　A. had he begun

　　B. did he begin

　　C. he began

　　D. he had begun

　　【答案】B

　　【解析】考察倒装句。Not until放在句首的时候，后面的句子使有部分倒装的形式，故排除CD。再看时态，本句不需要使用过去完成时。句意：直到他离开家，他才知道家对他来说是多么重要。

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