100 câu trắc nghiệm Thì quá khứ hoàn thành tiếp diễn (Past Perfect Continuous) có đáp án
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Before the teacher entered the classroom, the students ________ (talk) loudly.

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Before the teacher entered the classroom, the students ________ (talk) loudly.

talked

had been talking

were talking

have talked

Giải thích

Chọn đáp án: B