A professor and a writer _________present at the meeting.
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A
was
B
is
C
were
D
hadbeen
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Grammar mistakes of this kind _____ widely among Chinese students. 
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A
have been made
B
has been made
C
have made
D
has made
 Has ____ how many spies we caught during the war ____ up to now?
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A
it been declared; have been set free
B
it declared; have been set free
C
they declared; has been set free
D
they declared; have set free