—How long may I keep the book?—You keep it for two weeks. A. may B. must C. will

问题补充：

—How long may I keep the book?

—You keep it for two weeks.

A. may B. must C. will

答案：

解析：考查情态动词的用法。根据句意：我可以借这本书多久？你可以借两周。B，C两项译成汉语不通顺，故选A。