100 câu trắc nghiệm Thì quá khứ hoàn thành tiếp diễn (Past Perfect Continuous) có đáp án
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By the time the train arrived, I ________ (stand) on the platform for twenty minutes.

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By the time the train arrived, I ________ (stand) on the platform for twenty minutes.

stood

have stood

had been standing

was standing

Giải thích

Chọn đáp án: C