this is the biggest mistake we have made.A. In a wayB. In this wayC. To the degreeD. In a

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(答案→)A. In a way
B. In this way
C. To the degree
D. In a degree
解析：介词短语辨析。A在某种程度上；B用这种方法；D有点，稍微；句意：在某种程度上，这是我们犯过的最大的错误。故A正确。