问题补充：
—What was it that caused the party to be put off?
— the invitations.
A. Because Tom delayed sending
B. Tom delayed to send
C. That Tom delayed sending
D. Tom delayed sending
答案：
A. Because Tom delayed sending
B. Tom delayed to send
(答案→)C. That Tom delayed sending
D. Tom delayed sending
解析：考查强调句的简略回答。问句是强调句型，被强调部分是主语，所以答话人回答的是主语部分。将答语补充完整应为“That Tom delayed sending the invitations caused the party to be put off.”，这里that不能省略。
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