A-A+
You can' t ______your promise; all the people
问题详情
You can" t ______your promise; all the people here are depending on you.
A．back off
B．back up
C．back on to
D．back out of
参考答案
正确答案：D
解析：句意：你不能食言，这儿所有人都指望着你呢。Back out of收回，停止不干。 Back on后退。back up支持，援助；倒退。back on to背对着。
