5000 câu trắc nghiệm Tiếng Anh 9 có đáp án - Phần 25
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The lecturer last night didn't know what he was talking about, but if Dr. Mason_____,

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The lecturer last night didn't know what he was talking about, but if Dr. Mason_____, I would have listed carefully.

had been lecturing

was lecturing

would lecture

lectured

Giải thích

Chọn đáp án A