问题：
—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
—What was it that caused the party to be put off?
—________ the invitations.
—________ the invitations.
| A．Because Tom delayed sending |
| B．Tom delayed to send |
| C．That Tom delayed sending |
| D．Tom delayed sending |
参考答案：