Everyone had an application form in his hand, but no one knew which office .A. to send it

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

(答案→)A. to send it toB. to send itC. to be sent toD. 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

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