Youmustworkouttheproblemallbyyou

发布时间:2020-07-27 09:18:37

You must work out the problem all by yourself, ________ it is very difficult.A.as ifB.evenC.butD.even though

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D解析even though/even if表示“即使”,引导让步状语从句。as if/as though意为“好像”,引导方式状语从句。
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