问题

Some dogs just don’t know _______ fun.
A:how have
B:how to have
C:how having
D:how to has
B:how to have
C:how having
D:how to has
正确答案是:
同类题型
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He spoke English so well that I took _______ for granted that he was an American.
I’m _____ tired _____ I can’t walk any more. [ ]
Look! The farmers are still working _____ the heavy rain.[ ]