【题目】An invention is a new way of solving a problem, so try our best to think of many ________and unusual ways.
A．varying
B．variety
C．varied
D．variation
在线课程【答案】C
【解析】句意：发明就是解决问题的新方法，所以我们应尽最大的努力去想不同的独特的方法。varied“不相同的”。
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