100 câu trắc nghiệm Thì quá khứ hoàn thành tiếp diễn (Past Perfect Continuous) có đáp án
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They were exhausted because they ________ on the construction site all day.

72/100

They were exhausted because they ________ on the construction site all day.

worked

have been working

were working

had been working

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Chọn đáp án: D