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When he was a little boy，he ______ on the farm.
A．used to workingB．used to work
C．got used to workD．was used to work
B
used to do sth.意為"過去經(jīng)常做某事"。be used to do sth.意為"被用來做某事"。be/get used to doing sth."習慣于做某事"。
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