【題目】You must do more exercise, ______ twice a week.

A. at least B. at last C. at most

【答案】A

【解析】句意：你必須多做鍛煉，至少一周兩次。at least至少；at last最后；at most最多。根據(jù)You must do more exercise可知此處強調(diào)多做鍛煉，因此次數(shù)應(yīng)多，故選A。

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