Everyone had a form in his hand but no one knew which officeA. to send it toB. to sent i

问题补充：

Everyone had a form in his hand, but no one knew which office．

A. to send it to

B. to sent it

C. to be sent to

D. to have it sent

答案：

(答案→)A. to send it to

B. to sent it

C. to be sent to

D. to have it sent

解析：考查定语从句。句意：没有人知道把它寄到哪个办公室。句子可还原：不是定语从句时应该是to send it to that office room，要换成定语从句office room 作为先行词提前，并把that 换成 which修饰office。