We have written (A) to each other (B) when
Câu hỏi
Nhận biếtWe have written (A) to each other (B) when (C) we were (D) in primary school.
Đáp án đúng: C
Lời giải của Tự Học 365
Giải chi tiết:
Đáp án C. when sửa thành since. Ta thấy trong câu có 2 mệnh đề, 1 mệnh đề chia thì hiện tại hoàn thành, 1 mệnh đề chia thì quá khứ đơn nên ta không sử dụng when mà phải sử dụng since.
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