问题
选择题
It is said that________is good for our teeth. [ ]
A. chew gum
B. chewing gum
C. buying gum
D. eating gum
答案
答案：B
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It is said that________is good for our teeth. [ ]
A. chew gum
B. chewing gum
C. buying gum
D. eating gum
答案：B