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【题目】Take one pill (药片) ________. 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。吃太多对你的健康有害。考查介词短语辨析。at a time一次/每次;at times不时地,相当于sometimesin time及时;on time准时。根据句意语境,可知后面三项不合句意,故选A

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