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In those days,whenever I had difficulties,I _____ Mr.Wang fo

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In those days,whenever I had difficulties,I _____ Mr.Wang for help.A used to...
In those days,whenever I had difficulties,I _____ Mr.Wang for help.
A used to go to
B was used to go to
C would go to
D used to going to
选哪个?原因?
选C.A,used to do sth是过去常常做但现在不做了; B,be used to do sth 是被用来做.;C,would 作情态动词表示过去常常; D,used to doing 是习惯于做.