_______you choose to contact us, you can expect our efficient and helpful service.

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问题 _______you choose to contact us, you can expect our efficient and helpful service.

选项 A、as long as than
B、Ever since
C、No matter how
D、Even though

答案C

解析 本题考查状语从句的联系词。根据主句和从句的内容可推断,从句可以是条件状语或让步状语。条件状语从句通常由if(如果),unless(除非),as long as(只要)等引出,让步状语从句通常由though/although,even though/even if,no mater…/however/whatever…引出,though和although意为“虽然”,even if/even.though意为“即使”,no mater…/however/whatever…意为“无论……”。在四个选项中,选项C和选项D都可用于引出让步状语从句,两者相比,选项C在词义上更适合本句句意的要求。选项A本身就是错误的,正确的用法应该是no sooner…than…,意为“一…就……”,no sooner后为主句部分,动词要用过去完成时,而且动词要与主语倒装,than后为从句部分,动词为一般过去时,例如No sooner had he drunk his coffee than he left.他一喝完咖啡就走了。选项B用于引出时间状语从句,意为“自从……”。
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