What made you think he ……….in the Royal Air Force?
-
A.
must have to be
-
B.
had been
-
C.
was being
-
D.
had had to be
Câu này tạm dịch như sau: Điều gì làm cho bạn nghĩ anh ấy đã từng thuộc Lực lượng không quân hoàng gia?
- must không dùng với have to => loại A
- had been: thì quá khứ hoàn thành diễn tả hành động này xảy ra trước hành động made phía trước => Chọn B
- was being sai vì động từ "be" không chia tiếp diễn => loại C
- had had to be cũng sai vì không tồn tại thì này => loại D
=> What made you think he had been in the Royal Air Force?
Đáp án : B
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