题干
Everyone has a form in his hand, but no one knows which office ___.
A：to have it sent
B：to send it
C：to send it to
D：to be sent to
答案(点此获取答案解析）
C
A：to have it sent
B：to send it
C：to send it to
D：to be sent to
（2）
（3）
（4）