回答时请顺便说明一下 .

回答时请顺便说明一下 .
1.we read anything ____ we could find on the education of minority groups.
A that B which C about which D in which
(为什么是选A而不是选D?)
2.____ was discussed before,copper is seldom used in its pure form except in the electrical industry.
A that B which C what D as
(本句话的答案是D D选项中的AS是表示什么意思?)
3.it was ____ every one went to the beach.
A such hot a weather so
B such hot weather that
C a hot enough weather so that
D so hot weather that
(为什么是选B而不是D 形容词不是应该用SO修饰么?)