题干

—Why didn’t you remind him of the possible danger?
—But what ______ otherwise? He never listens to me.
A.could I doB.could I have doneC.should I doD.must I have done
上一题 下一题 0.64难度 单项选择 更新时间:2013-07-21 08:30:42

答案(点此获取答案解析)