American English has changed ________ time. There are several reasons ________ this.
#4632
A
over; for
B
for; with
C
in; of
D
during; about
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China is a country __________ 56 different nationalities, among which Han ________ the majority of its population.
#4611
A
making up of; consists of
B
consisting of; makes up
C
made up of; consisting of
D
consisted of; making up of
Edward, you play so well. But I ______ you played the piano. 
#5038
A
didn’t know
B
hadn’t known
C
don’t know
D
haven’t known