单选题_____AfactorBresourceCsourceDcause
单选题
_____
A
factor
B
resource
C
source
D
cause
参考解析
解析：
根据文章的内容，这里指的是“外汇来源”。source来源，根源；source of income收入来源。factor因素；resource资源；cause原因。
根据文章的内容，这里指的是“外汇来源”。source来源，根源；source of income收入来源。factor因素；resource资源；cause原因。
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