That is worthwhile pointing out that heating may bring about certain
单选题That is worthwhile pointing out that heating may bring about certain change in the structure of any material.
A.This
B.There
C.What
D.It
参考答案：D
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答案解析：这句话的意思是：值得指出的是，加热可能会导致任何材料结构发生某些变化。本题考查it作形式主语的用法。此处pointing out that...部分是句子真正的主语，作形式主语的只能是it，因此选D。
