he is one of the world-famous musicians,by the time he was six,he composinghe is one of the world-famous musicians,by the time he was six,he composingAhad begun B begins C would begin D have begun.为什么不选D而选C呢

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heisoneoftheworld-famousmusicians,bythetimehewassix,hecomposingheisoneoftheworld-famousmusicians,byt

he is one of the world-famous musicians,by the time he was six,he composinghe is one of the world-famous musicians,by the time he was six,he composingAhad begun B begins C would begin D have begun.为什么不选D而选C呢
he is one of the world-famous musicians,by the time he was six,he composing
he is one of the world-famous musicians,by the time he was six,he composing
Ahad begun B begins C would begin D have begun.为什么不选D而选C呢

he is one of the world-famous musicians,by the time he was six,he composinghe is one of the world-famous musicians,by the time he was six,he composingAhad begun B begins C would begin D have begun.为什么不选D而选C呢
he was six,是过去式,D.have begun 是现在完成式,时态不符合,故选C !