题目内容
根据上句完成下句:The girl began to learn to play the piano when she was four.
______ the age [eid]n. 年龄 of four, the girl began to
learn to play the piano.
答案:At
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题目内容
根据上句完成下句:The girl began to learn to play the piano when she was four.
______ the age [eid]n. 年龄 of four, the girl began to
learn to play the piano.