100 câu trắc nghiệm Thì quá khứ hoàn thành tiếp diễn (Past Perfect Continuous) có đáp án
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I ________ (wait) for her for hours before she came.

12/100

I ________ (wait) for her for hours before she came.

had been waiting

has been waiting

had been waited

had waited

Giải thích

Chọn đáp án: A