问题描述：
Students are not allowed to read such books___are harmful to their body and mind.
上题选项：
A.as B.which C.that D.because which
After several days of marching through the tropical forest,the group of soldiers reached___used to be wasteland.
A.there B.where C.what D.that
第一题为什么不选that?
上题选项：
A.as B.which C.that D.because which
After several days of marching through the tropical forest,the group of soldiers reached___used to be wasteland.
A.there B.where C.what D.that
第一题为什么不选that?
问题解答：
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