— Is it good to look up every new word when I come across it in reading?—No you because y

问题补充：

— 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. don have to

B. shouldn

C. can

D. mustn

答案：

(答案→)A. don have to

B. shouldn

C. can

D. mustn

解析：考查情态动词用法。Don’t have to不必；shouldn’t不应该；can’t不可能；mustn’t禁止，千万不能；句意：—当我在阅读的时候，查每一个生单词好吗？—你不必这样做。因为你可能从上下文中猜出这个词的意思的。根据句意说明A正确。