I often spend half an hour ______ in the morning.A．exerciseB．exercisesC．exercisi_刷题宝

题干

I often spend half an hour ______ in the morning.

A．exercise

B．exercises

C．exercising

D．to exercise

上一题下一题 0.85难度单选题更新时间:2019-08-18 06:47:37

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