下列各句中没有语病的一句是（ ）

I didn’t understand _____________, so I put up my hand to ask him.

The number of people ________ this happens is not verylarge

How about going to the movie this evening? –_________, but I have to prepare for the Englishcontest.A．I can’t

Our class adviser doesn’t doubt，in any case.___.we can overcome the difficulties in our study.Healways gives us a confident smile.