In the cross-lake swimming race, a boat will be ____in case of an emergency.
A.standing by
B.turning on
C.getting on
D.running on
网友回答
A解析句意：有船只严阵以待，预防紧急情况。stand by 为不及物短语：to wait and be ready for action if needed 准备行动；待机；turn on 打开；get on进展；run down撞倒。根据句意，B 、C、D 三项均不符合。