—Bill can I use your dictionary? I left mine at home.—Of course you. Glad to help you.A.

问题补充：

—Bill, can I use your dictionary? I left mine at home.

—Of course you. Glad to help you.

A. need

B. may

C. must

D. can

答案：

A. need

B. may

C. must

(答案→)D. can

解析：根据上面的问句用的是情态动词can，回答时也应该用can回答。本句的意思是“我能用一下你的字典吗？”“当然可以。”所以本题选D。