Question

it's rather hot in the room.You'd better--the windows or the door

横线处为什么填not close而不是填not to close

Answer 1

You'd better do sth 你最好做某事
否定形式是You'd better not do sth你最好不要做某事
这个是固定句式，You'd better=you had better

Answer 2

you'd better 后面加动词原形