100 câu trắc nghiệm Thì quá khứ hoàn thành tiếp diễn (Past Perfect Continuous) có đáp án
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She was out of breath because she ________ after her train.

67/100

She was out of breath because she ________ after her train.

ran

had been running

was running

has been running

Giải thích

Chọn đáp án: B