"Where can I find Jim? He is ______ his work. He won’t leave the lab until 6:00 p.m.

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问题 "Where can I find Jim? He is ______ his work. He won’t leave the lab until 6:00 p.m.

选项 A、on
B、over
C、at
D、under

答案C

解析 be at sth.是固定搭配,相当于be busy with sth.或be engaged in sth.,有“忙于…”的意思。
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