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I _______ to him because he called me up soon after.

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I _______ to him because he called me up soon after.
A didn’t need write \x05B needn’t to write
C couldn’t have written \x05D needn’t have written
为什么选D
I _______ to him because he called me up soon after.
D needn’t have written
我不需要再给他写信,因为他不久后就给我打了电话.不必做,应该使用完成体,C在以以上不对,因为从后半句看,不是不能,而是不必