---It’s very kind you help me complete the difficult job.You’re welcome.A. to; for B.

问题补充：

---It’s very kind you help me complete the difficult job.

--- You’re welcome.

A. to; for B. for; of C. of; to

答案：

解析：to到，不定式符号；for为了；of……的。句意：帮助我完成这项艰巨的工作，你太好心了。——不客气。固定句式It’s adj of sb to do sth，故选C。