Question

It's impossible for all the people to get jobs because _____of them are not fit for them.

A. none
B. all
C. not all
D. every one

Answer 1

答案B
not与all连用为部分否定，表示“并非所有的……都……”；D项中every one与not连用也可表示部分否定，但谓语动词要用单数。