He was ill ._was why he didn't attend the meeting A.It B.This C.That 选C,求详解

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He was ill ._was why he didn't attend the meeting A.It B.This C.That 选C,求详解

it 通常指前文提到过的“同一”物体(必须是同一个)
this 通常指“这个”
that 可以指前文提到过的某种情况