--- Whose ic book is it?
--- It be Daniel’s. He often shares his ic books with his friends.
A. must
B. can’t
C. mustn’t
D. can
网友回答
(答案→)A. must
B. can’t
C. mustn’t
D. can
解析：本题考查的情态动词表示的推测语气，又根据He often shares his ic books with his friends.，说明这是肯定推测的，故选答案为A