______ has been mentioned above, the size of a canal depends upon the kind of bo

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问题 ______ has been mentioned above, the size of a canal depends upon the kind of boats going through it.

选项 A、What
B、This
C、As
D、It

答案 C

解析在本题中，as用作关系代词，引导的是非限定性的定语从句。同类用法更为常见的表达又如As is known to all，．．．。本题中的其他选项均没有这样的用法，故都应该被排除掉。

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______hasbeenmentionedabove,thesizeofacanaldependsuponthekindofbo