1、C 光比声音传播的快.这是客观真理,要使用一般现在时
2、C 主从句的时态要一致
3、A.固定句型
It is the +序数词+time that +从句（要使用现在完成时）
4、D .that it was retrieved 是the information 的同位语从句
1.when I was in high school ,my teacher told me that light _
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