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---Don'tskateonthelake!---Whynot?Isn'titthickenough?A.toskateB.skatingonC.skatingD.toskateon

题目详情

---Don't skate on the lake!

---Why not? Isn't it thick enough___________?

A. to skate    B. skating on    C. skating     D. to skate on

 

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D