问题
We can’t work out the physics problem. Can you tell us ________
A:how to do
B:what to do it
C:how to do it
D:what should to do;
B:what to do it
C:how to do it
D:what should to do;
正确答案是：
同类题型
Isn’t it time you got down to ________ the papers?
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“Only two centimeters higher,break the world record,” encouraged the coach.