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Trial and error are the source of our knowledge.A、isB、wereC、hasD、have beenA时
Trial and error are the source of our knowledge.A、isB、wereC、hasD、have beenA时
游客
2023-12-26
58
管理
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
时态应用。短语trial and error(反复实验)是单数主语，后面谓语动词应用第三人称单数的“is”而非“are”。
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