100 câu trắc nghiệm Thì quá khứ hoàn thành tiếp diễn (Past Perfect Continuous) có đáp án
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The flat was lovely and tidy because my flatmate ________.

56/100

The flat was lovely and tidy because my flatmate ________.

had cleaned

was cleaning

had been cleaning

had been cleaned

Giải thích

Chọn đáp án: A