问题补充：
---Mum, I’m going out with my classmate tonight.
---OK. But you’d better back too late.
A. don’t come
B. not to come
C. not coming
D. not come
答案：
A. don’t come
B. not to come
C. not coming
D. not come
解析：考查动词。句意：妈妈，今晚我打算跟我的同学出去。好的，最好不要回来得太晚。考查固定句型had better do sth最好做某事。所以选D项。
