Question

Most people ________ live in less developed countries are quite poor.

1. A.
   who
2. B.
   whom
3. C.
   then
4. D.
   which

Answer 1

A
解析：先行词为人，关系代词应用who，whom，排除C、D两项。又因从句中缺少主语部分，而whom只作宾语，故用who，答案选A。