单选题
The Monroe Doctrine of 1823 was ______of United States policy concerning the activities and rights of European powers in North and South America.
A、
when a statement
B、
as a statement
C、
a statement
D、
to a statement
【正确答案】
C
【答案解析】
解析：本题考查句子结构。该句的谓语为was，空格处应该填能充当表语的结构。根据句意，名词statement充当表语是正确的。
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