问题详情：
I really appreciate ________ to help me with my maths，but I'm afraid that I have no time this week.
A．you to offer B．it you offer
C．your offering D．this you are offering
【回答】
C [考查appreciate 的用法。句意：我真的很感激你主动提出帮我学数学，但是恐怕这周我没时间。appreciate “感激”，后跟v.ing 作宾语，故*选C。]
知识点：非谓语动词
题型：选择题
