—Is it good a look up every new word when I come across it in reading?—No,Youbecause you

—Is it good a 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. don’t have to
D. ought not to

A. can’t　　　　B. mustn’t(答案→)C. don’t have toD. ought not to解析：本题考查情态动词。don’t have to不必；mustn’t禁止、不允许。

这个问题的回答的对