请教!俩个英语习题解答!1.)__ this test is reliable.A.It is apparently that B.There is appearance that C.It appears that D.It must have been that 这道题为什么要选C,不能选A?求详解2.)__ as much as one-third of all timber harves

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请教!俩个英语习题解答!
1.)__ this test is reliable.
A.It is apparently that B.There is appearance that C.It appears that D.It must have been that 这道题为什么要选C,不能选A?求详解
2.)__ as much as one-third of all timber harvested is not used proved to be false.
A.The estimate B.The estimate that C.It is estimated that D.They are estimated
答案选B,为什么不能是C呢?求详解
这两个题我觉得差不多,为什么选项不一样呢?区别在哪里呢?

1,至于A,直接用apparently就行,如果用It is apparently that,那么后面就不能用 is 了,而用(should)be.这是虚拟语气要求的一种.
2,这个句子中,is 是动词,is 前面的部分是主语.所以前部分不能是一个句子,c选项组成的就是一个句子,所以不行.B选项就行.

A应当是It's apparent that
that-引出同位语从句,该句的谓语是prove,若加了it is estimated that,就多了个谓语(is)

apparently是副词,,要不就是it is apparent that
the estimate that ,,that是引导句子从句的出现,,是同为主语