首页
登录
职称英语
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
2025-01-21
23
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”。
转载请注明原文地址:http://tihaiku.com/zcyy/3922792.html
相关试题推荐
Wheredoesmostoceanplasticcomefrom?A、Industrialwastesources.B、Household
非洲自然资源丰富,发展潜力巨大。Africahasabundantnaturalresourcesandahugepotentialford
Trialanderrorarethesourceofourknowledge.A、isB、wereC、hasD、havebeenA短
Eventhoughthemainsourceof______exposureforamajorityofthehumanpopul
Thepossibilitiesfor______energysources,includingsolarpower,windpower,ge
Eventhoughthemainsourceof______exposureforamajorityofthehumanpopulat
Thepossibilitiesfor______energysources,includingsolarpower,windpower,ge
Eventhoughthemainsourceof________exposureforamajorityofthehumanpopu
Trialanderrorarethesourceofourknowledge.A、isB、wereC、hasD、havebeenA时
Thepossibilitiesfor________energysources,includingsolarpower,windpower,
随机试题
WhenSpanishfootballclubBarcelonapaidUS$35millionforRonaldinholast
ShoppinghabitsintheUnitedStateshavechangedgreatlyinthelastquarte
借款人无法足额偿还贷款本息,即使执行担保,也肯定要造成较大损失的贷款属于( )
红细胞的功能有()A. B. C.缓冲血浆pH D.提高血浆渗透压
治疗痰饮眩晕,宜选用A.桂枝 B.麻黄 C.防风 D.香薷 E.紫苏
小儿惊风可见A.面色淡青或青黑 B.面色与口唇青紫 C.面色青黄 D.眉间
肝素作为抗凝剂最常用于()A.红细胞脆性试验 B.血细胞比容 C.血细胞计数
甲状腺腺瘤患者的肿块特点是A.质地较硬 B.表面不平 C.边界清楚 D.双
课程计划又称()计划,是国家根据一定的教育目的和培养目标制定的有关学校
在社会主义经济体制下,市场对资源配置起()作用。A.辅助性 B.先导性 C
最新回复
(
0
)