公共英语二级
A．call
B．may
C．need
D．must
【知识拓展】Can、may、must、need的用法
1．Can表示能力，“能，会”；表示怀疑，猜测，常用于否定句或疑问句。
e．g．：Can you play basketball?你会打篮球吗?
2．may表示推测，“可能，也许”。
e．g．：He may come tomorrow．他可能明天过来。
3．must表示“必须，应该”；表示推测“一定”。
e．g．：There is someone knocking at the door．It must be Jim．
有人在敲门，肯定是吉姆。
4．need表示“需要”。
e．g．：You needn’t come to school SO early．你不需要那么早来学校。
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