【題目】Take one pill (藥片) ________. Too many are bad for your health.

A. at a timeB. at timesC. in timeD. on time

【答案】A

【解析】

句意：一次服一片。吃太多對你的健康有害。考查介詞短語辨析。at a time一次/每次；at times不時地，相當于sometimes；in time及時；on time準時。根據(jù)句意語境，可知后面三項不合句意，故選A。

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