All his attention ___on the novel. so he didn't even notice

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All his attention ___on the novel. so he didn't even notice the teacher come in.
A has been fixed
B was fixing
C was fixed
D fixed
答案：C
为什么不选A什么时候主从句时态一致?什么时候用完成时?

A 属现在时态的范畴,而主句指的是过去,时态不一致.
现在的分心“看小说”不会对过去的“没注意到老师进来”构成因果关系,是不是?
至于什么时候用完成时,首先得看是不是陈述现在的动作或情况,再看是不是强调已经发生的动作对现在的影响等.注意从时间和逻辑关系上去推敲.

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