Everyone had an application form in his hand, but no one knew which office .
A. to send it to
B. to send it
C. to be sent to
D. to have it sent
网友回答
(答案→)A. to send it to
B. to send it
C. to be sent to
D. to have it sent
解析：考查疑问词+不定式做宾语，做这样的题目可以用还原法：no one knew which office to sent it to= no one knew which office they should send it to，介词to的宾语which office，可以把宾语从句改成疑问词+不定式，句意是：每个人手里都有一份申请书，但是没有人知道把申请书寄到哪个办公室。选C