Alex is busy _______ for his exams. C. studying Trắc nghiệm môn Ngữ pháp Tiếng

Câu hỏi :

Alex is busy _______ for his exams.

A. to study

B. studied

C. studying

D. studies

* Đáp án

C

* Hướng dẫn giải

Cấu trúc: be busy + V-ing

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