--Whatcausedthepartytobeputoff?--- 

問題詳情：

-- 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

知識點：非謂語動詞

題型：選擇題