100 câu trắc nghiệm Thì quá khứ hoàn thành tiếp diễn (Past Perfect Continuous) có đáp án
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By the time we arrived, they ________ (wait) for us for over an hour.

76/100

By the time we arrived, they ________ (wait) for us for over an hour.

had been waiting

had waited

were waiting

waited

Giải thích

Chọn đáp án: A