his mother ______ him interesting stories when he was young.A.was used to tellingB.used to tellingC.is used to tellingD.used to tell选哪一个 为什么?

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his mother ______ him interesting stories when he was young.
A.was used to telling
B.used to telling
C.is used to telling
D.used to tell
选哪一个 为什么?

D
used to do sth指曾经做某事(有现在不做了的意思)

D.表示过去常常做...