—What caused the party to be put off?
— the invitations.
A. Tom delayed sending
B. Tom’s delaying sending
C. Tom delaying to send
D. Tom delayed to send
网友回答
A. Tom delayed sending
(答案→)B. Tom’s delaying sending
C. Tom delaying to send
D. Tom delayed to send
解析：Tom’s delaying sending是-ing形式的复合结构可代替what在句中作主语。