I’m very glad I have my own room in my house. I do what I want in it.A. mustB. have toC.

问题补充：

I’m very glad I have my own room in my house. I do what I want in it.

A. must

B. have to

C. need

D. can

答案：

A. must

B. have to

C. need

(答案→)D. can

解析：本题的含义是我很高兴在我家有我自己的房间，所以我可以做我自己想做的事情，can表示可以的含义，故本题选D。