题目内容
Some dogs just don’t know _______ fun.
A.how have | B.how to have | C.how having | D.how to has |
B
考查疑问词+不定式结构。句意:一些狗只是不知道怎样玩得高兴。选B。
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A.how have | B.how to have | C.how having | D.how to has |