—I don't know which to buy.  Can you give me some advice?

—You _______ try on this T-shirt. It looks nice. [ ]

A. had not better

B. had better not

C. had better

D. had better to

（）是非电量保护。

A、主变油温高；

B、主变油位异常；

C、主变绕组温度高；

D、发电机误上电。