【題目】My sister practices playing the guitar ______half an hour every day.

A. on B. at C. in D. for

【答案】D

【解析】句意：我姐姐每天練習(xí)彈吉他半個小時。play the guitar彈吉他，half an hour 半小時， for后面加一段時間表示持續(xù)了多長時間，故選擇D。

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