104 câu trắc nghiệm Thì quá khứ hoàn thành (Past Perfect) có đáp án
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 I couldn’t see the teacher because he ________ before I arrived to school.

97/104

 I couldn’t see the teacher because he ________ before I arrived to school.

had left

has left

left

was leaving

Giải thích

Chọn đáp án: A