I usually exercise .A. about at ten thirty B.at about ten thirty C.at ten thirty about

发布时间：2020-08-23 07:56:52

I usually exercise     .
A. about at ten thirty  B.at about ten thirty C.at ten thirty about

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解析：句意：我通常在10点半锻炼。在具体的时刻用介词at,故选B
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