Paper books still play an important role in the US textbook market, with digital textbooks __________ less than 5 percent of the total.
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A
composing of
B
making up
C
consisted of
D
accounted for
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They have had a long and bitter struggle _____their living conditions.
#98367
A
to improving
B
for improving
C
to improve
D
improve
The building ______ next year will be a restaurant．
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A
having been built
B
to be built
C
being built
D
built