The police ____(be)searching for the lostchild at this time yesterday

问题描述:

The police ____(be)searching for the lostchild at this time yesterday

本题考查单复数形式,
police是个整体名词谓语动词要用复数,再根据时态,因为后面有个yesterday,所以要用过去式,所以答案是were.