5000 câu trắc nghiệm Tiếng Anh 9 có đáp án - Phần 92
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He was busy when I phoned but I hung_______ until he was free. a. back b. off c. to d. on

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He was busy when I phoned but I hung_______ until he was free.

back

off

to

on

Giải thích

Chọn đáp án D