100 câu trắc nghiệm Thì quá khứ hoàn thành tiếp diễn (Past Perfect Continuous) có đáp án
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By the time the movie ended, they ________ the marathon for five hours.

74/100

By the time the movie ended, they ________ the marathon for five hours.

were watching

had watched

had been watching

watched

Giải thích

Chọn đáp án: C