The opening cerenony is to be held in the lecture hall this afternoon,（）can seat 4 people.

题目

The opening cerenony is to be held in the lecture hall this afternoon,（）can seat 4 people.
where when hatwhich

答案

不选when,是因为这个空是表示地点的,而不是表示时间.
不选that,是因为如果用that,前边不能有逗号.
不选which,除非原题改成The opening cerenony is to be held in the lecture hall this afternoon,in _____ can seat 4 people.
选where,是因为这个空刚好是表示地点的.