500 Câu trắc nghiệm tổng hợp ngữ pháp Tiếng Anh thi THPT Quốc gia (Phần 7)
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While the waiter was picking up the broken plates, he ---------- his finger

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While the waiter was picking up the broken plates, he ---------- his finger.

cut

was cutting

had cut

cuts

Giải thích

Chọn A