题目：
It was announced that only when the terrible disease was under control ________ to return to their homes.
A．the residents would decide
B．would the residents decide
C．would the residents be decided
D．the residents would be decided
答案：
答案：B
题目分析：only置于句首，强调状语时，主句采用部分倒装句的形式。句意：人们宣称只有当这种疾病被控制以后，居民才会决定回到他们的家园。
