Trial and error ______ the source of our knowledge.

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问题 Trial and error ______ the source of our knowledge.

选项 A、is
B、are
C、has been
D、have been

答案A

解析本题考查短语应用。本题句意为：反复试验才是我们知识的来源：trail and error表示“反复试验，试错法”，指一种研究方法，后面应接单数动词is。

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本试题收录于：公共英语二级笔试题库公共英语（PETS）分类

公共英语二级笔试

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