If Tom ______ an alarm, the thieves wouldn't have broken into his house.
A. was installed
B. to install
C. had installed
D. have installed
Ta dùng câu điều kiện loại 3 diễn tả một hành động không xảy ra trong quá khứ
Cấu trúc: If + S + had + Vp2, S + could/would + have PP +…
Tạm dịch: Nếu Tom đã cài chuông báo động, những tên trộm sẽ không đột nhập vào nhà anh ta.
Đáp án cần chọn là: C
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