题目内容

13．As is known to all，the number of students in senior high school is increasing．

分析 众所周知，高中学生的数量正在增加．

解答 答案：As
解析：分析句子结构可知前面分句缺少主语，根据句意可知后一分句即为前面分句的主语；且前后句子之间有逗号，故本题考查as一词引导的定语从句．As引导定语从句时可以用来指代整个句子，且位置灵活（可位于先行词前也可位于先行词后）；而which/that等关系代词及其他关系副词引导的定语从句只能位于先行词后面（故本题不可使用这些引导词）．

点评 本题考查单词填空，做此类题目时一定要仔细分析句子结构并根据所给提示及其它要求确定所填词的正确形式．

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