Choose the best answer.
Listen! I think someone _______ (knock) at the door.
A. has been knocking
B. is knocking
C. knocks
D. knocked
=>Listen! I think someone is knocking at the door.
Tạm dịch:Nghe kìa! Tôi nghĩ là có ai đó đang gõ cửa.
Đáp án cần chọn là: B
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