— I borrow your English book?—Yes of course you . A. Could; couldB. Must; canC. Could; c

问题补充：

— I borrow your English book?

—Yes, of course you .

A. Could; could

B. Must; can

C. Could; can

D. Can; could

答案：

A. Could; could

B. Must; can

C. Could; can

D. Can; could

解析：can,could表示许可，可以做某事，could比can更委婉一些must的含义是必须，对于must开头的疑问句，否定回答通常用needn 或not have to ,表示不必.以could和can开头的句子，常用can 或can’t来回答。故选C。