A new study shows older men a lack of deep sleep are nearly twice as likely to develop hig

问题补充：

A new study shows older men a lack of deep sleep are nearly twice as likely to develop high blood pressure.

A. suffering for

B. who is suffering

C. who suffer from

D. who suffer to

答案：

A. suffering for

B. who is suffering

(答案→)C. who suffer from

D. who suffer to

解析：现在分词、定语从句都可作定语但是“遭受…”要用suffer或者suffer from;所以排除A、D两个选项，B选项who is suffering 中的who指的是men要用动词are，所以只能选C who suffer from相当于分词suffering from的作用。