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Trial and error are the source of our knowledge.A、isB、wereC、hasD、have beenA本
Trial and error are the source of our knowledge.A、isB、wereC、hasD、have beenA本
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2023-12-27
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问题
Trial and error
are
the source of our knowledge.
选项
A、is
B、were
C、has
D、have been
答案
A
解析
本题考查主谓一致和时态。trial and error“反复实验”，是固定用法，当单数处理，所以谓语动词应用第三人称单数；又因为此举是在陈述一般事实，所以用一般现在时态。所以，答案为A。
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