Everybody was exhausted. It looked as if they (work) ____________ hard.
A. worked
B. had worked
C. work
D. works
Dấu hiệu: Everybody was exhausted =>sử dụng câu giả định với As if ở quá khứ
Cấu trúc: It looked as if + S + had + Vp2
=>Everybody was exhausted. It looked as if they had worked hard.
Tạm dịch: Mọi người đều kiệt sức. Có vẻ như họ đã làm việc chăm chỉ.
Đáp án cần chọn là: B
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