问题补充：
what caused the party to be put off?
A. Jim delayed sending
B. Jim’s delaying sending
C. Jim delayed to send
D. Jim delaying to send
答案：
A. Jim delayed sending
(答案→)B. Jim’s delaying sending
C. Jim delayed to send
D. Jim delaying to send
解析：考察省略句，该句为省略句，完整的答句应当是，Jims delaying sending caused the party to be put off。 该部分作caused的主语，其中delay doing sth为固定用法
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