The number of foreign students attending Chinese universities ________ rising steadily since1990. 
#104967
A
is
B
are
C
has been
D
have been
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He _______ foreigners in his cafe before, so he didn’t know how to serve the American family.
#102169
A
had rarely had
B
had had rarely
C
rarely had
D
had rarely
When I said someone cheated in the English exam, I ______ you.
#103548
A
wasn’t referring to
B
had referred to
C
hasn’t referred to
D
will refer to