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

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

had been lecturing

was lecturing

would lecture

lectured

Giải thích

Đáp án: A

Giải thích: Câu điều kiện 3: If + S + had Vp2/had been Ving, S + would have Vp2

Dịch: Người thuyết trình tối qua không biết anh ấy đang nói về cái gì, nhưng nếu Tiến sĩ Mason đang giảng bài, tôi sẽ nghe một cách chú ý.