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6.---Was that new school master who walked by

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6.---Was that new school master who walked by
--- _____.
A.It must be that B.It must have been
C.He must be D.This must have been
请问这个题为什么选B
6.---Was that new school master who walked by
must have been是情态动词的用法之一,用来表示对过去所发生的事情的一种肯定的推断：“刚才走过去的那位是新校长吗?一定是的.”
因为主句中的谓语动词用的是过去时,因此可以判断是“对过去所发生的事情的一种肯定的推断”所以只有B和D符合要求.表示上文所提到的内容不能用this来代替,但是可以用it.
所以答案只能是B
----Wsa that the new school master who walked by? a new master that(who) will teach you german will come tomor By who was this new educational CD-ROM designed?改错 改错:By who was the new educational CD-ROM designed? 英语翻译was hampered somewhat by the realisation that the new te Who is the student that was laet for school today?对不对为什么连接词不 Who is the student __ was late for school today 一定要用that,不能用 i()(not go) to school by bike yesterday.i walked to school by who was the book written Who was made ( ) by the strange man? 4.I was so angry at all that he was doing that l walked out Who was late for school yesterday?