—Must I return this book before Friday, Sir?
—No, you ________,dear. You can keep it for two weeks.
句意：——先生，我必须在星期五之前归还这本书吗？——不，你不必，亲爱的。你可以借两周。
考查情态动词辨析。can’t不能；shouldn’t不应该；mustn’t禁止；needn’t不必。must引导的一般疑问句，否定句用needn’t回答，故选D。
—Must I return this book before Friday, Sir?
—No, you ________,dear. You can keep it for two weeks.
You’d better take an umbrella when you go out, because it ________rain.
The man _______ be a doctor in this hospital, but I’m not sure.
—Whose notebook is this?
—It ________ be Alan’s. It looks like his.
Mary ________ go to London next year but she is not sure.
