When he was working there he caught a serious illness from efforts he still suff

When he was working there he caught a serious illness from _____ efforts he still suffers.

A. which B. that

C. whose D. what

试题答案

C

from whose efforts he still suffers 为修饰 a serious illness 的定语从句，whose 在定语从句中用作定语，修饰 efforts。