问题
选择题
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
答案：C
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。