150 câu trắc nghiệm Tìm lỗi sai nâng cao (P4)
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Unless there had been a heavy storm, the climbers will not have died

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Unless there had been a heavy storm, the climbers will not have died.

(A) Unless

(B) Had been

(C) Heavy

(D) Will

Giải thích

Đáp án D => would

câu điều kiện loại 3: If S had been PII, S would have PII