—Whynottalkwithyourparentsaboutyourwillingnesstoattend2...

問題詳情：

—Why not talk with your parents about your willingness to attend 2016 Peking University Summer Camp?

—I tried _______ to get them to listen to me.

A. in time                       B. in vain                      C. in need                   D. in case

【回答】

B

知識點：介詞

題型：選擇題