NO.PZ2020011901000064
问题如下：
Which of the following is closest to the ratio of the size of the OTC market to size of the exchange traded market in 2017:
选项：
A. 2
B. 4
C. 7
D. 16
解释：
(c). The OTC market is about eight times as big as the exchange-traded market.
这题哪里有讲 好像没看到过
