题目内容
He was walking along the corridor
A. back and forth B. to and from C. up and down D. upside down
A
考查词组用法。back and forth表示“来回地”。
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题目内容
He was walking along the corridor
A. back and forth B. to and from C. up and down D. upside down
A
考查词组用法。back and forth表示“来回地”。