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

问题补充：

—Is it good a look up every new word when I come across it in reading?

—No,Youbecause 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

答案：

A. can’t

B. mustn’t

(答案→)C. don’t have to

D. 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。