By the time Ryan finally graduated from high school, he ________five different schools because his parents moved frequently.

Câu hỏi :

By the time Ryan finally graduated from high school, he ________five different schools because his parents moved frequently.

A. attended

B. was attending

C. had attended

D. has been attending

* Đáp án

C

* Hướng dẫn giải

By the time QKĐ, QKHT

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