问题描述：
一道SAT句子提升
Economics is (when you study) the production,distribution,and consumption of goods and services.
A.
B.your studying of
C.doing a studing on
D.the study of
Economics is (when you study) the production,distribution,and consumption of goods and services.
A.
B.your studying of
C.doing a studing on
D.the study of
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