100 câu trắc nghiệm Thì quá khứ hoàn thành tiếp diễn (Past Perfect Continuous) có đáp án
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The line is busy. Mandy ________ on the phone for hours.

59/100

The line is busy. Mandy ________ on the phone for hours.

talked

has talked

has been talking

had been talking

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Chọn đáp án: D