He taught himself to play the violin __________practising all night.
A.by
B.with by
C.at by
D.on
正确答案:A
介词by常和动名词连用说明方式手段等
He taught himself to play the violin __________practising all night.
A.by
B.with by
C.at by
D.on
正确答案:A
介词by常和动名词连用说明方式手段等