Đáp án A.
FOR REVIEW
Cấu trúc đảo ngữ của câu điêu kiện như sau:
Câu điều kiện loại 1: If + S + V (simple present)
Should (not) + s + V infinitive
Câu điều kiện loại 2: If + S + V (past subjunctive)
Were + s + (not) + to V
Câu điều kiện loại 3: If + S + V (past perfect)
Had (not) + s+ PII
Đây là câu điều kiện loại 1 do đó đáp án chính xác là A
Tạm dịch: Nếu có gì khẩn cấp, hãy gọi 911
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