单项选择题

He must be in the building because he was seen______the building just now.

A. entering
B. enter
C. to enter
D. having entered
<上一题 目录 下一题>
热门 试题

单项选择题
They took ______ measures to prevent poisonous gases from escaping.
A. fruitful
B. beneficial
C. sufficient
D. effective
相关试题