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

66/100

By the time they reached the restaurant, they ________ for over an hour.

were waiting

had been waiting

have been waiting

waited

Giải thích

Chọn đáp án: B