100 câu trắc nghiệm Thì quá khứ hoàn thành tiếp diễn (Past Perfect Continuous) có đáp án
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Carlos ________ all day, so he had a headache.

48/100

Carlos ________ all day, so he had a headache.

had worked

was working

has been working

had been working

Giải thích

Chọn đáp án: D