问题补充：
The employers often give the job to they believe have work experience with a strong
sense of duty.
A. whoever
B. whomever
C. who
D. those who
答案：
A. whoever
B. whomever
C. who
(答案→)D. those who
解析：本题易误选A。注意空后have的主语必须是复数，由此可排除A，whomever不能作主语。who含有疑问，所以D符合语法和语境。
