问题

_________do you see a dentist—Once a month.

A:to learn; to practice
B:learning; practice
C:learn; practicing
D:learns; to practice;

正确答案是：

同类题型

29Can you say _____ certain when he will come here?

.—Can you give some advice on what I said just now? —SorryMy mind______.

why can’t I have _____ new bike—Dear, you know, ______ money doesn’t grow ontrees

. —The train hasn’t come yet. It is half an hour late. — Yes. It __________ here at 2:02 as scheduled.

I enjoy playing computer games, but I can’t too much time that