Somebody must have caused the fire on purpose.
B. The fire must have been caused on purpose.
C. The fire must have caused somebody on purpose.
Giải bởi Vietjack
Đáp án. B
Giải thích: Đây là cấu trúc bị động với động từ khuyết thiếu ở thể hoàn thành must have been + PII (phỏng đoán hẳn là chuyện gì đã được làm trong quá khứ) nên C và D sai. A sai vì on purpose là trạng từ bổ nghĩa cho động từ cause, không phải cho danh từ the fire.
Dịch nghĩa: Hẳn là có kẻ đã cố tình gây ra đám cháy.
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