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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.
80. The argument in the passage depends on which of the following assumptions?
(A) The supply of illegal drugs dropped substantially in 1987.
(B) The price paid for most illegal drugs by the average consumer did not drop substantially in 1987.
(C) Domestic production of illegal drugs increased at a higher rate than did the entry of such drugs into the country.
(D) The wholesale price of a few illegal drugs increased substantially in 1987.
(E) A drop in demand for most illegal drugs in 1987 was not the sole cause of the drop in their wholesale price.
请问大牛：为什么A, B, C, D选项为什么不对。OG给出的解释是说，对他们取非之后，原文结论仍然成立。 我怎么也想不明白对他们取非之后和原文有什么关系？这样子，我可能存在两个误区：
1。对原文的结论理解有误。（我对原文逻辑是：price decreased-->program failure）.
2。对选项取非的方法有错误。这个我很弱。我取非如下：
A: The supply of illega drugs didn't drop substantially in 1987.
B. The price paid for most illegal drugs by the average consumer did drop substantially in 1987.
C.Domestic production of illegal drugs did not increased at a higher rate than did the entry of such drugs into the country.
D. The wholesale price of few illegal drugs increased substantially in 1987.
我这样子取非有问题吗？如果不对，应该如何取非呢？
如果取非正确，那么他们取非后对原结论有什么影响啊？我实在看不出来。 | 
