100 câu trắc nghiệm Thì quá khứ hoàn thành tiếp diễn (Past Perfect Continuous) có đáp án
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________ (Amy/ learn) Chinese before she went to Beijing?

32/100

________ (Amy/ learn) Chinese before she went to Beijing?

Had Amy learned

Had Amy been learning

Had Amy learn

Amy learned

Giải thích

Chọn đáp án: B