When he was young,he ______ the old man.A.used to call on B.used to callA.used to call on B.used to calling on C.was used to call on D.was used to calling on

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When he was young,he ______ the old man.A.used to call on B.used to callA.used to call on B.used to calling on C.was used to call on D.was used to calling on

When he was young,he ______ the old man.A.used to call on B.used to callA.used to call on B.used to calling on C.was used to call on D.was used to calling on
When he was young,he ______ the old man.A.used to call on B.used to call
A.used to call on B.used to calling on C.was used to call on D.was used to calling on

When he was young,he ______ the old man.A.used to call on B.used to callA.used to call on B.used to calling on C.was used to call on D.was used to calling on
A 当他年轻的时候,经常拜访老人.use to do sth.过去常干某事,现在不做了.
use to doing sth.习惯做某事

A. used to call on
used to 过去常常
call on 拜访