1.the program to control the entry of illegal drugs into the country was a
failure in 1987. if the program had been successful, the wholesale price of
most illegal drugs would not have dropped substantially in 1987.
問缺少哪個assumption?
答案是 a drop in demand for most illegal drugs in 1987 was not the sole cause
of the drop in their wholesale price.
我不太懂題目跟答案的連結在哪裡耶，有高手能為小弟解答嗎@@
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