Courage, intelligence, and experience all ______ to overcome obstacles.

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问题 Courage, intelligence, and experience all ______ to overcome obstacles.

选项 A、helps
B、helping
C、help
D、helped

答案C

解析 如果选B和D选项,就会缺少谓语动词,所以首先排除B和D选项。句子的主语是由and连接的三个并列的名词,因此谓语动词要用复数形式,故选C。
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