问题
选择题
_____ we were worried about was _______ they could manage to control the pollution.
A．That; how
B．That; whether
C．What; that
D．What; whether
答案
答案：C
这题考查名词性从句的用法,what引导的是主语从句，what在主语从句中做宾语，that引导表语从句，在从句中不做成分。句意是：我们担心的是,是否他们能设法控制祝污染。