1、Is it in that factory ________ “Red Flag” cars are produced?
A.which
B.when
C.that
D.as
2、The population in China ________ reduced in recent years
A.have been
B.has been
C.is
D.are
3、“Must we hand in our exercise-books now?” “No, you ________”
A.don’t
B.needn’t
C.mustn’t
D.can’t
4、Although we ________ in this neighborhood for 5 years so far, we haven’t got to know many people yet
A.were
B.have been
C.had been
D.are
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