Choose the best answer to complete the sentence below.
Mrs. Pike _______ the door before the customers arrived.
had opened
will open
would open
has opened
Cấu trúc: S + had + Ved/ V3 before S + Ved/ V2
Cấu trúc: S + had + Ved/ V3 before S + Ved/ V2
=> Mrs. Pike had opened the door before the customers arrived.
Tạm dịch: Bà Pike đã mở cửa trước khi khách hàng đến.
Đáp án : A