Mary is the only one of the teachers who ________ a little Chinese because she is one of my friends who ________ been to China.
#85562
A
know；have
B
knows；has
C
knows；have
D
know；has
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One-third of the country____ covered with trees and the majority of the citizens______ black people.
#85894
A
is ; are
B
is ; is
C
are ; are
D
are ; is
Don't miss the meeting. The questions to be discussed at it _____ of great importance.
#86154
A
is
B
are
C
was
D
will