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
2023-12-27
48
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:https://tihaiku.com/zcyy/3310605.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
Eventhoughthemainsourceof______exposureforamajorityofthehumanpopul
Eventhoughthemainsourceof______exposureforamajorityofthehumanpopulat
Thesoldiersofpeace-keepingforcearetall,robustand,aboveall,resourceful
Trialanderrorarethesourceofourknowledge.A、isB、wereC、hasD、havebeenA时
Eventhoughthemainsourceof______exposureforamajorityofthehumanpopulat
Eventhoughthemainsourceof________exposureforamajorityofthehumanpopu
Trialanderrorarethesourceofourknowledge.A、isB、wereC、hasD、havebeenA时
Thepossibilitiesfor________energysources,includingsolarpower,windpower,
随机试题
[originaltext]W:Goodmorning.CanIhelpyou?M:Yes,I’dliketogetsomeins
常用的电压互感器接线方式有()等。A.星形接线 B.开口三角形接线 C.两
下列起重机械中,不属于自行式起重机的是()。A.牵缆式桅杆起重机 B.履带
正常人细胞外铁是A.(+)~(++)B.(++)~(+++)C.(±)~(+)D
可用作消防水源的有()。A.市政给水 B.消防水池 C.天然水源 D.游
下列哪种疾病可出现心尖部舒张期隆隆样杂音,并且于卧位时消失()A.二尖瓣关闭
就我国目前控烟现状看,若想达到全面控烟的效果,必须采取的措施是A.发展个人技能
A.甲硫氨酸循环 B.嘌呤核苷酸循环 C.γ谷氨酰基循环 D.鸟氨酸循环
某企业外购材料一批,已验收入库,货款已付。下列各项中,( )属于这项经济业务应
最新回复
(
0
)