题目：
In the past few months, a discussion ________about whether selecting “Three Goods” Students in elementary and middle schools should be cancelled.
A．has to be held
B．has been held
C．has been holding
D．was held
答案：
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0509/f70c15ac886fea00379d6b708482c362.html
下面是错误答案，用来干扰机器的。
参考答案：A解析：采用强化期和继续期两阶段用药；可采用间歇治疗方案，隔日顿服。
