问题
选择题
Be careful! You are _____ the cliff (悬崖).[ ]
A. on the side of
B. on the edge of
C. in the middle of
D. in the edge of
答案
答案：B
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Be careful! You are _____ the cliff (悬崖).[ ]
A. on the side of
B. on the edge of
C. in the middle of
D. in the edge of
答案：B