____in history when remarkable progress in relatively short periods of time.

A.There has time B.it is time C.There has been time

我觉得选B啊。。怎么答案是C？求解释

2。“were all the people in the bus injured?"

"NO,_____only five passengers who got hurt."

我觉得应该填there were....为什么答案是it was？？？

3。___was no doubt that his health was returning.

我觉得应该填it..如果把it was...that 去掉。。句子也通啊

可是答案偏偏是there？。。。。。

4.where there is shale____likely to be oil.

我填it is ..答案又是。。。。there is ........我无语的不理解啊

1、B的话，后面通常加doing的，而there be也是一个句型，在remarkable progress为主语时，最好用于被动。

2、因为这句后面有who，所以要用it was来引导强调句

3、这是固定句型。there be no doubt：毋容置疑的

4、因为这个要与前面对称，前面出现there is；后面也是填there is才能被where引导