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【题目】Don't try to do everything at once. Do one ________.

A. at times B. at any time

C. at a time D. at all times

【答案】C

【解析】句意:不要试图同时做每件事。一次做一个。考查介词短语辨析题。A. at times有时,间或,相当于sometimes;B. at any time随时任何时候;C. at a time依次,每次;D. at all times每时每刻,相当于always。根据句意语境,可知ABD三项意思都与句意不合,故选C。

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