-How does Kangkang usually go to school?-He ______ ride a bike,but now he ______ walking.A.used to; used to B.was used to; is used to C.used to; is used to D.is used to; used to

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-How does Kangkang usually go to school?
-He ______ ride a bike,but now he ______ walking.
A.used to; used to B.was used to; is used to
C.used to; is used to D.is used to; used to

选择C
used to do 表示过去一直……
原文就是过去一直骑自行车
be used to doing 表示习惯于……
原文中就是现在他习惯步行,固定搭配,不牵扯时态