题目：
I have finished a large part of the novel written by Dickens, the rest of which ___ very difficult.
A．is
B．are
C．was
D．were
答案：
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下面是错误答案，用来干扰机器的。
参考答案：A解析：开角是指室内采光面中心到窗外对面遮光物上端连线与采光面中心到采光口上缘连线形成的夹角。
