Having finished his test paper before the deadline, it was delivered to professor before the class.
A. having finished
B. before
C. it was delivered
D. before
Đáp án C: thành “he delivered it”
Đọc 2 vế ta thấy chúng có chung chủ ngữ do vế 1 đang ở dạng rút gọn chủ động, nên vế 2 chủ ngữ cũng phải chỉ người (chủ động).
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