The number of teachers in this school() unknown.
A.are
B.is being
C.is
D.are being
A.are
B.is being
C.is
D.are being
第6题
War and peace ____________a constant theme in the history of the world.
A. is
B. are
C. have been
D. has been
第7题
Her children____________far away from her, the old lady feels lonely sometimes.
A. to live
B. living
C. lived
D. having lived
第8题
____________, the rivers were open and navigable.
A. Being summer
B. Been summer
C. To be summer
D. It was summer
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