问题
选择题
Paper books still play an important role in the US textbook market, with digital textbooks __________ less than 5 percent of the total.
A．composing of
B．making up
C．consisted of
D．accounted for
答案
答案：B
非谓语动词考查题。Make up 与digital textbooks为主谓关系用现在分词作补语。句意：纸质的书籍在美国课本市场仍然起着重要作用，数字书籍只占总数的百分之五。