The library is full of students ____ for the coming exam.

A. busily prepared
B. busy preparing
C. busily prepare
D. are busy preparing
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科目：高中英語 來源：同步題 題型：單選題

The library is full of students ____ for the coming exam.
[     ]
A. busily prepared
B. busy preparing
C. busily prepare
D. are busy preparing

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