5.The teacher is often ______ the classroom.
A.on B.of C.up and down D.down
答案:C
why?
參考答案:up and down
adv.
上下地, 到处, 前前后后, 来来往往
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5.The teacher is often ______ the classroom.
A.on B.of C.up and down D.down
答案:C
why?
參考答案:up and down
adv.
上下地, 到处, 前前后后, 来来往往