— What caused the party to be put off?— _____ the invitation

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— What caused the party to be put off?— _____ the invitations.
A.Tom delayed sending B.Tom’s delaying sending
B.Tom’s delaying sending是-ing形式的复合结构可代替what在句中作主语.

第一个问句换成陈述语气就是xx导致了晚会的延迟!XX就是这句话的主语,也就是WHAT.
选项A是个主谓结构的短句,不能做主语
选项b ing形式使其成为ing的名词形式,名词可以做主语,故选项B实质上是一个名词短语

— What caused the party to be put off?— _____ the invitation What caused the party to be put off?— ——what was it that caused the party to be put off?——（）the i 非谓语动词难题二道1.-what caused the party to be put off?-_____ the i what on earth caused the evening party to be put off ? ___ t 求助一道英语单选题——Can we put off the party till Sunday?——_____ .The what if it —— The sports meeting will be put off . _____ is what I want to tell you:the meeting is put off till What I want to tell you is ( ) :the meeting will be put off the flight had to be put off----------the thick fog _____ ； we had to put the meeting off. It____heavily,the outing had to be put off.