1.It is not unusual for workers in that region_______.
A. to be paid more than a month late
B. to be paid later than more a month

2.---Mary isn't here now.
--- ______ left by the side door.
A.Must she have
B.Should she have
C.Might she have
D.Had she


3.Understanding the cultural habits of another nation,especially_______containing as many different subcultures as the United States ,is a complex task.
A.the one B. one C.such D.that C为什么不可以

1,choose"A",〔more than one/a/an + 单数名词〕
2,choose"c", A 是对过去事实的肯定推测,前提条件是必须要有充分的原因,B 虚拟语气,意为本应该做某事而没做,C 是对过去事实的一般推测,只是一种可能,符合本题意 D 是省去了"IF"的条件状语从句的表达方式,也表示一种虚拟
3,根据句意,此处应填一个既能充当主语成分又表示特指的词,四个选项只能用"THE ONE",原句应是这样的"Understanding the cultural habits of another nation,especially the one (that/which is)containing as many different subcultures as the United States ,is a complex task.