问题补充：
At present, there are many instances the governments distribute money to the citizens worldwide, but the sources of fund are still limited.
A. how
B. which
C. where
D. when
答案：
A. how
B. which
(答案→)C. where
D. when
解析：句意：现在有很多的政府把钱捐献给全世界范围的人的例子，但是资金的来源还是很有限。这里是定语从句，先行词是instances，定语从句中不缺主宾表，缺少in the instances，是抽象的地点，用where引导定语从句，选C。
