had better do sth 最好做某事
had better not do sth 最好别做某事
由此可见,题目并无正确答案.
正确答案可以是 you'd better (go to) the cinema by bus 你最好坐车去电影院
也可以是 you'd better (not go to) the cinema by bus 你最好别坐车去电影院