单选题
It is very difficult for non-governmental organizations to measure the ______ of the aid they supply to developing nations.
(A) finding
(B) satisfaction
(C) accuracy
(D) effectiveness
A
B
C
D
【正确答案】
D
【答案解析】
[词汇] effectiveness效力
[错误答案] (A)(调查，研究等的)结果 (B)满意(C)准确性
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