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

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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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