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问题: 高二英语作业求助

P50---15
Is it good to look up every new word when I come across it in reading?
No .You ___because you are likely to guess the meaning from the context
A. can’t
B. mustn’t
C. needn’t
D. ought not to

解答:

A. can’t 不能
B. mustn’t 不必要
C. needn’t 不需要
D. ought not to 不应该

应该是D