题干

—Everyone in my class passed the exam.
—Oh, really? It ________ difficult.
A.can’t have beenB.needn’t have been
C.must beD.mightn’t be
上一题 下一题 0.64难度 单项选择 更新时间:2013-11-06 03:10:39

答案(点此获取答案解析)