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

______ 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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