问题补充:
The dog is very smart, but sometimes it’s boring.
A. a kind of
B. kind of
C. kinds of
D. all kinds of
答案:
A. a kind of
(答案→)B. kind of
C. kinds of
D. all kinds of
解析:A. a kind of 一种 B. kind of 有一点 C. kinds of 各种各样的 D. all kinds of各种各样的;句意:这条狗非常聪明,但是它有时候也有点让人厌烦。故选B
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