问题描述：
In recent years,with the help of our teacher,I have made __ rapid progress in __ math.
A.a;the B.a;不填 C.不填;the D.不填;不填
为什么选D
A.a;the B.a;不填 C.不填;the D.不填;不填
为什么选D
问题解答：
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