问题描述：
有关情态动词虚拟语气等
——You didn't wait for Mr.Black last night,did you?
——No,but we＿.He didn't return home at all.
A.couldn't have B.needn't have
C.didn't need to D.should have wait
说出选项并讲的详细一些,
我就是不太清楚A为什么不能对，难道不可以翻译成我们不可能等，因为他没回来。
........
——You didn't wait for Mr.Black last night,did you?
——No,but we＿.He didn't return home at all.
A.couldn't have B.needn't have
C.didn't need to D.should have wait
说出选项并讲的详细一些,
我就是不太清楚A为什么不能对，难道不可以翻译成我们不可能等，因为他没回来。
........
问题解答：
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