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
推荐题目
_____________ many times, the problems were settled at last.
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A
Having discussed
B
Being discussed
C
To be discussed
D
Discussed
 _______ with the size of the whole earth, the highest mountain does not seem high at all.
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A
Compare
B
Comparing
C
When compared
D
When comparing