581.The trees _______ in the storm have been moved off the road.
A.being blown down
B.blown down
C.blowing down
D.to blow down
582.Can those ________ at the back of the classroom hear me?
No problem.
A.seat
B.sit
C.seated
D.sat
581.答案是B;blown down修饰trees，表示已被暴风刮倒的树木。
582.答案是C;sit为不及物动词，常用sitting作定语；而seat为及物动词，常用seated作定语。
