一：Their plan ____ to be a perfect one.A.proved B.was proved选

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一：
Their plan ____ to be a perfect one.
A.proved B.was proved
选A还是选B啊
为什么
二：什么动词可以做系动词啊,像PROVE也可以做系动词哦,
系动词有什么特性

一：
1）be proved to be...强调的是一个被动的动作,意思只能翻译成“...被证明/证实是...的”；
2）而prove to be...不强调被动,更多是强调结果,其意思是可以翻译为“...证明是/原来是/结果是.的”.
3）只要句子并不强调被动即(+ by sb/sth)“被...所证明是...的”时,习惯上更多使用prove to be...句型.
选A
二：作为系动词,它本身有词义,但不能单独用作谓语,后边必须跟表语,亦称补语（形容词）,构成系表结构说明主语的状况、性质、特征等情况.
1）状态系动词
用来表示主语性质或状态,只有be一词,例如：He is a teacher.他是一名教师.（表示主语的身份－－性质） He is ill.他病了.（表示主语的状态）
2）持续系动词
用来表示主语继续或保持一种状况或态度,主要有keep,rest,remain,stay,lie,stand,例如：He always kept silent at meeting.他开会时总保持沉默.This matter rests a mystery.此事仍是一个谜.
3）表像系动词
用来表示"看起来像"这一概念,主要有seem,appear,look,例如：He looks tired.他看起来很累.He seems (to be) very sad.他看起来很伤心.
4）感官系动词
感官系动词主要有feel,smell,sound,taste,例如：This kind of cloth feels very soft.这种布手感很软.This flower smells very sweet.这朵花闻起来很香.
5）变化系动词
这些系动词表示主语变成什么样,变化系动词主要有become,grow,turn,fall,get,go,come,run.例如：He became mad after that.自那之后,他疯了.She grew rich within a short time.她没多长时间就富了.
6）终止系动词
表示主语已终止动作,主要有prove,turn out,表达"证实","变成"之意,例如：The rumor proved false.这谣言证实有假.The search proved difficult.搜查证实很难.His plan turned out a success.他的计划终于成功了.（turn out表终止性结果）

一：Their plan ____ to be a perfect one.A.proved B.was proved选 His plan ____to be a perfect one.A proved B.was proved C. is His theory___to be true. A.proved B.was proved C.is proved D plan A have proved to be a failure. 选哪个,请给出原因.A.proving B.proved C.was proved D.has been proved 英语翻译Rose's sprain proved to be a serious one,owing to neglec The years he spent in the countryside proved to be a(an)____ As it happened,my advice _____to be wrong.A.proved B.was pro the gentleman______you told me yersterday proved to be a thi as the Web proved to be more than a fashion,. proved to be用法 my adviece proved to be correct my adviece was proved to be