100 câu trắc nghiệm Thì quá khứ hoàn thành tiếp diễn (Past Perfect Continuous) có đáp án
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She ________ (teach) chemistry before she became a journalist.

14/100

She ________ (teach) chemistry before she became a journalist.

had teached

had been taught

had been teaching

had been teached

Giải thích

Chọn đáp án: A