____ we get on well with a number of people , we are usually friends with only a very few．

____ we get on well with a number of people , we are usually friends with only a very few．

    A．As                 B．Once              C．Before           D．While

____ we get on well with a number of people , we are usually friends with only a very few．

1. A.
   As
2. B.
   Once
3. C.
   Before
4. D.
   While

We get on well with a number of people, ________ we are usually friends with only a few.

[　　]

__________we get on well with a number of people，we are usually friends with only a few．

A．While    B．Since    C．If     D．As long as