21世纪教育网
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B.of
C.at
D.on
2.A.There
B.They
C.This
D.It
3.A.has
B.is
C.are
D.have
4.A.students'
B.teachers
C.students
D.teachers'
5.A.A
B.An
C.The
D./
6.A.class
B.school
C.grade
D.library
7.A.Your
B.Our
C.Their
D.Her
8.A.him
B.you
C.us
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