選擇填空。
My father is very busy. He is still ______ work now.

A. at
B. on
C. for
D. in

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科目：初中英語 來源：同步題 題型：單選題

選擇填空。
My father is very busy. He is still ______ work now.
[     ]

A. at
B. on
C. for
D. in

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