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. can’t
B. mustn’t
C. don’t have to
D. shouldn’t
答案：
A. can’t
B. mustn’t
(答案→)C. don’t have to
D. shouldn’t
解析：词义辨析。can’t不能；mustn’t不可以；don’t have to不必 ；shouldn’t不应该。句意：查我在阅读中遇到的每个生词, 这样做好么？不好。你没必要，因为你能根据课文猜出词义。所以选C。
