Question

【題目】—It's nearly 6:00 p.m. Will you have supper here?
—Sorry, I ____. I have many things to do.
A.mustn't
B.can't
C.needn't
D.won't

Answer 1

【答案】B
【解析】句意：將近傍晚六點(diǎn)鐘了，你在這里吃晚飯好嗎？—對(duì)不起，我不能，我有很多事情要做。A. mustn't禁止，B. can't 不能；C. needn't 不必；D. won't不會(huì)。will在這里表示一種委婉的語氣，不表將來時(shí)態(tài)，對(duì)于別人發(fā)出的邀請(qǐng)，如果不同意，常說Sorry, I can't. 然后加上理由，故選B。