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-Look out,you were almost hit by a truck.-Oh,thank you.But I

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-Look out,you were almost hit by a truck.-Oh,thank you.But I --------about a maths problem.
A.was thinking B.had been thinking
选A,为什么?
是过去完成进行时,就是相对过去的某个时刻来说已经对现在有直接影响并且还在进行的动作.但是想数学题只是过去的那一刻,现在没有在进行