The chemistry teacher asked the pupil ______.

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问题 The chemistry teacher asked the pupil ______.

选项 A、what water composes of
B、what does water compose of
C、what is water composed of
D、what water is composed of

答案D

解析首先我们要考虑从句不能用疑问句的形式，要用陈述语序，B和C错误，短语“由……组成”是be composed of，A也不对，D正确。

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