100 câu trắc nghiệm Thì quá khứ hoàn thành tiếp diễn (Past Perfect Continuous) có đáp án
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He ________ (practice) for the competition for weeks before he got injured.

82/100

He ________ (practice) for the competition for weeks before he got injured.

practiced

had been practicing

has practiced

was practicing

Giải thích

Chọn đáp án: B