单选题,要说明道理.I don't know the reason _____ youwere absent from

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单选题,要说明道理.
I don't know the reason _____ youwere absent from the meeting,but I am not sure that someone will tell me the reason_____ you haven't told me.
1.why;that 2.that;why 3.of which;that 4.because;why
请一定说明原因.

选1
第一填why是因为why引导修饰reason的定语从句第二填that是因为“told me the reason”中reason提前用that连接构成了一个宾语前置.
只有分清了句子结构,这类题就好做了

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