Question

When he was working there he caught a serious illness from _____ efforts he stil

When he was working there he caught a serious illness from _____ efforts he still suffers.
A. which
B. that
C. whose
D. what

Answer 1

答案雀源C

C。from whose efforts he still suffers 为修饰 a serious illness 的定语洞拆从句，whose 在定语从纳岁枣句中用作定语，修饰 efforts。