100 câu trắc nghiệm Thì quá khứ hoàn thành tiếp diễn (Past Perfect Continuous) có đáp án
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 Mandy was exhausted by the time she went on holiday because she ______ over 55 hours a week.

55/100

 Mandy was exhausted by the time she went on holiday because she ______ over 55 hours a week.

works

worked

had been working

had worked

Giải thích

Chọn đáp án: C