527.Fred entered without knockign and,very out of breath,sank ___ a chair.
A.on
B.off
C.into
D.to
528.Animals suffered at the hands of man _____ they were destroyed by people to make way for agricultural land to provide food for more people.
A.in which
B.for which
C.so that
D.in that
527.答案是C;sink into chair 颓然坐在椅子上。
528.答案是D;in that 引导原因状语从句。
