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【简答题】
Edison was a clever boy, and ______ he was four, he had learned advance mathematics by himself．
Edison was a clever boy, and ______ he was four, he had learned advance mathematics by himself.
A.whenever
B.by the time
C.the moment
D.ever since
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参考解析：
刷刷题刷刷变学霸
举一反三
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