Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions ___________, Joe was annoyed to find that he had left his key a...

Câu hỏi :

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions

A. After returned to his office

B. To have just returned to his office

C. Upon returning to his office

D. Having been returned to his office

* Đáp án

C

* Hướng dẫn giải

Đáp án C

upon + Ving: vào lúc, đúng lúc

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