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Helen was good at____the piano when she was six.A.plays B.to play C.playing D.played.请做讲解.

题目详情
Helen was good at____the piano when she was six.A.plays B.to play C.playing D.played.请做讲解.
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答案和解析
C
be good at doing sth 固定短语 表示擅长某事