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I don’t know the reason he was absent.A、whyB、becauseC、whichD、as
I don’t know the reason he was absent.
A、why
B、because
C、which
D、as
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题目内容
（请给出正确答案）
I don’t know the reason he was absent.
A、why
B、because
C、which
D、as
答案
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