问题标题：
1.Theiceisthickenough_____A.towalkonB.forwalkingC.towaleD.towalkonit2.Sheoftencomestovisituswithout____whetherwearefteeornot.A.askedB.askingC.toaskD.ask3.Theroomissodirtythatisneeds____badly.A.cleanB.tocleanC.b
问题描述：
1.Theiceisthickenough_____
A.towalkonB.forwalkingC.towaleD.towalkonit
2.Sheoftencomestovisituswithout____whetherwearefteeornot.
A.askedB.askingC.toaskD.ask
3.Theroomissodirtythatisneeds____badly.
A.cleanB.tocleanC.beimgcleanD.cleaning
4.Thepatientisgoingtohavehistooth_____.
A.pulloutB.topulloutC.pulledoutD.pulling
赖铁明回答：
1.Denoughtodosth是固定搭配
2.Bwithout是介词,后接名词.
3.Bneed后接todo
4.D牙齿是被拔,所以用过去分词,表被动.
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