题目内容
(请给出正确答案)
[主观题]
"Where can I find Jim?" "He is ______ his work. He won' t leave the lab until 6:00 p. m."A
"Where can I find Jim?" "He is ______ his work. He won' t leave the lab until 6:00 p. m."
A.on
B.over
C.at
D.under
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