Don't disturb me.I__a composition all the morning and haven't finished yet.A.was writingB.have writtenC.have been writing这几个选项都表示什么时态,分别在什么情况下使用?

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Don''tdisturbme.I__acompositionallthemorningandhaven''tfinishedyet.A.waswritingB.havewrittenC.havebeen

Don't disturb me.I__a composition all the morning and haven't finished yet.A.was writingB.have writtenC.have been writing这几个选项都表示什么时态,分别在什么情况下使用?
Don't disturb me.I__a composition all the morning and haven't finished yet.
A.was writing
B.have written
C.have been writing
这几个选项都表示什么时态,分别在什么情况下使用?

Don't disturb me.I__a composition all the morning and haven't finished yet.A.was writingB.have writtenC.have been writing这几个选项都表示什么时态,分别在什么情况下使用?
c
现在完成进行时
表示从过去某一时间开始做某事该动作一直持续到现在

C.have been writing 一直再写并持续到现在 所以选这个
A.was writing 是过去进行时 与 all the morning不搭配
B.have written 是过去完成 前后矛盾