B.needn't
C.can't
D.mustn't 答案 B 4.ought to / should (1)意为“应该”,表义务或责任,ought to的语气比should稍重。 【例14】 It's nearly seven o'clock.Jack ________ be here at any moment. A.must
B.need
C.should
D.can 答案 C (2)should表“竟然、万一”。 【例15】 You can't imagine that a wellbehaved gentleman ________ be so rude to a lady. A.might
B.need
C.should
D.would 答案 C 【例16】 If you ________ have any difficulty in getting spare parts, ring this number. A.ought to
B.should C.will
D.would 答案 B 5.need (1)意为“需要”,作情态动词用时,须跟动词原形,无人称、数、时态的变化,一般只用于否定句或疑问句中。在肯定句中一般用作行为动词。 【例17】 —I don't mind telling you what I know. —You ________.I'm not asking you for it. A.mustn't
B.may not C.can't
D.needn't 答案 D 【例18】 I don't think he ________ a new computer. A.need to buy
B.needs buy C.need buy
D.need 答案 C (2)以need开头的一般疑问句,若要作肯定回答,常用must,一般不用need。 【例19】 —Need I come? —Yes, you ________. A.need
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