【題目】I often spend half an hour ______ in the morning.

A.exerciseB.exercisesC.exercisingD.to exercise

【答案】C

【解析】

句意：我通常在早晨花半小時間運動。

根據(jù)spend time doing sth花時間做某事，固定搭配；exercise動詞原形，exercises單數(shù)形式，exercising動名詞，to exercise不定式；故選C。

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