Noonecanwalkthewirewithoutabitoffearunless
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问题详情:
No one can walk the wire without a bit of fear unless ________very young.
A.having been trained B.trained
C.to be trained D.being trained
【回答】
B [此句表示被动动作。]
知识点:非谓语动词
题型:选择题
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