题目内容
Paper first invented in China .
| A．is | B．are | C．was | D．were |
B
解析试题分析：句意：纸是首先在中国发明的。结合常识，纸的发明是过去的事，故用一般过去时，故排除AB两项。因为主语是paper不可数名词，故谓语用单数形式，故选B。
考点：考查时态和主谓一致的用法。
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