(Breaking) up water (into) hydrogen and oxygen is a good example of (as) is known as (a chemical change).

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问题 (Breaking) up water (into) hydrogen and oxygen is a good example of (as) is known as (a chemical change).

选项 A、Breaking
B、into
C、as
D、a chemical change

答案C

解析 as改为what。画线处应的是介词of的宾语,is的主语。as不符合,应该用what。
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