"Where can I find Jim?" "He is ______ his work. He won’t leave the lab until 6:0

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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

解析题型：语法类试题(介词搭配)。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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