题目内容

---Don't skate on the lake!
---Why not? Isn't it thick enough___________?
A．to skateB．skating onC．skatingD．to skate on
D

试题分析：句意:不要在湖上滑冰！为什么不行？冰还不够厚在上面滑冰吗？skate滑冰，滑冰是在湖上，还不定式to skate需要加一个介词on，表在冰上滑冰，故选D.
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