All the runners must ____before and after the race at the Olympic Games now.
问题描述：
All the runners must ____before and after the race at the Olympic Games now.
Aget tested Bget testing Chave tested D be testing 请问为什么选A呢
答
A get tested检查,体检
B 形式不对,得用被动
C也要用被动,而且must have done是虚拟语气：过去肯定做过某事.不和题意
D是进行时,而题目表达的意思是是一种客观事实,并不是正在进行的动作
翻译：现在,所有的跑步运动员在赛前赛后都要进行体检.
希望能帮到您,