100 câu trắc nghiệm Thì quá khứ hoàn thành tiếp diễn (Past Perfect Continuous) có đáp án
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James ________ medicine for years when he realized he didn't want to be a doctor.

61/100

James ________ medicine for years when he realized he didn't want to be a doctor.

was studying

studied

has studied

had been studying

Giải thích

Chọn đáp án: D