请问这两道英语选择题是考察哪部分语法知识的？总是错，想复习一下语法点了。谢谢。

. It is not uncommon for ________ problems of communication between old and young.
A. there to be
B. there being
C. there to being
D. there be
It is with her support _____he won the Nobel Prize.
A. which
B. that
C. what
D. when

A

先要吧混淆的部分去掉 比方说 not uncommon就是双重否定 就等于common

It is common for there to be problems .......

用一个简单的一点的句子 把这个当做一种模式来及

It is difficult for me to do the homework. 

(There are problems) vs (I do the homework)

(for there to be problems) vs (for me to do the homework)

B

这是非常典型的强调句

It is ...... that ......

可以把这个去掉变成

He won the Nobel Prize with her support. 

变成强调句 就是把要强调的部分放在It is ...... that ......里面