—MustIreturnthebooknow?  —I’mafraidyou

问题详情：

— Must I return the book now?

   — I’m afraid you ________ according to the library rules. But you can renew it.

A. need                B. can                      C. have to                  D. may

【回答】

C

知识点：情态动词

题型：选择题