—It’s very cold outside.
—Oh, yes. You’d better________ your coat.
句意：——外面很冷。——哦，是的。你最好穿上外套。
考查动词短语辨析和had better的用法。put on穿上；put up举起。根据“It’s very coldoutside.”可知，很冷所以要穿上外套，排除CD。had better do sth“最好做某事”，情态动词后加动词原形。故选A。
—It’s very cold outside.
—Oh, yes. You’d better________ your coat.
It’s getting dark. You’d better ________ out by yourself. It’s dangerous.
Time is limited! You'd better________your time any more.
We _________ try our best to fight against pollution.
—Sorry, Miss Chen. I missed the early bus, so I was late again.
—It doesn’t matter this time. You ________ leave home 10 minutes earlier than before in future.
We ________ eat or drink in the museum. It is against the rule.
I love the weekends,because I ________ get up early on Saturdays and Sundays.
To my joy, we_________go to the bank. Mary has lent us some money.
——Must I be back home before 6 o’clock?
——No, you ____. Butdon’t be too late.
—Must I get there on time? I'm too tired to walk on.
—I'm afraid you _______. You can't miss the good chance.
