问题
选择题
—Don't skate on the lake!
—Why not? Isn't it thick enough ______?[ ]
A. to skate
B. to skate on
C. skate
D. skate on
答案
答案：B
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—Don't skate on the lake!
—Why not? Isn't it thick enough ______?[ ]
A. to skate
B. to skate on
C. skate
D. skate on
答案：B