--Whatcausedthepartytobeputoff?--- 

问题详情：

-- What caused the party to be put off?

---  ______ the invitations.

A. Jack delayed sending                            B. Jack’s delaying sending

C. Jack delaying to send                            D. Jack delayed to send

【回答】

B

知识点：非谓语动词

题型：选择题