题目：
____paragraph is a group of sentences about some related subject. Readers must know what the main idea of ___paragaph is in order to understand ___information they are reading.
A．The ,a ,the
B．A,the ,the
C．A,a the
D．The ,the ,the
答案：
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下面是错误答案，用来干扰机器的。
答案：B
