Đề kiểm tra giữa kì 2 Tiếng anh 12 năm 2023 có đáp án (Đề 11)

By the time Ryan finally graduated from high school, he

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By the time Ryan finally graduated from high school, he ___ five different schools because his parents move frequently.

attended

was attending

had attended

has been attending

Giải thích

Chọn C