It is not uncommon for there___problems of communication between the old and the young.

It is not uncommon for there___problems of communication between the old and the young.
A.being
B.would be
C.be
D.to be
我选B,答案D.请问语法上A,B为啥不成,为什么只能选D，谢谢

It is absolutely essential that William___his study in spite of some learning difficulties.
A.will continue
B.continued
C.continue
D.continues
我选D，正确C，请问这是什么语法现象啊，原因，谢谢
也许有误吧,我也郁闷哪,不知道,谢谢你,真的太感谢啦

There to be 和 there being 的用法
There+be是一种常见的“表示存在”的句型。 There+be后可接名词或动名词。
There must be rules for the changes. 这些变化一定是有规则的。
There is no knowing what may happen. 谁也不知道将要发生什么事。
下面就there to be 和 there being 的用法做一简要介绍。
1.there to be 的用法
1) 用作动词的复合宾语。
Would you like there to be a picture on the wall? 你喜欢墙壁上挂一张画吗？
We don't want there to bve any commrade lagging behind. 我们不希望有一个同志掉队。
I don't want there to bwe any misunderstanding between us.我不希望我们之间有什么误会。
2) 用在It be + adj. for...的结构中
It is impossible for there to be any more chance. 不可能在有机会了。
It was too late for there to be any buses. 时间太晚，不会有汽车了。
We waited for there to be another opportunity. 我们期待着还有下一次机会。
2.there being 的用法
1) 用作介词后的复合宾语
I never dreamed of there being a picture on the wall. 我从未想到墙壁上有幅画。
I was wrong about there being some misunderstanding between us.认为我们之间有误解是我的错误。