Question

-Could you help me with my English homework, Nancy?

-Of course I____________. Glad to help.

A.could B.can C.must D.do

Answer

B

【解析】

句意：

-南希，你能帮我做英语作业吗？-当然可以。很乐意帮忙。A. could能；B. can能； C. must必须；D. do做。could如果是表示“可能、能够”用于一般过去时态时,回答可用could. 例如：Could he play the piano two years ago? 肯定回答Yes, he could.否定回答No, he couldn't. 如果表示“委婉、请求的语气”,回答用"can"例如：Could I use your computer? 肯定回答用Yes/ Of course, you can.但不能用Yes, you could.否定回答用Sorry, you can't.不用Sorry, you couldn't 。依据句意可知此题是表示委婉、请求的语气，故选B。