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It was not until then that I came to know that knowledge _______ only from practice.?

A.had comeB.has comeC.cameD.comes

D

解析試題分析:考查時態。本句中的knowledge comes only from practice是一個客觀真理;在任何情況下都使用一般現在時。故D正確。
考點:考查時態
點評:在英語中表示客觀真理的句子在任何情況下都要使用一般現在時,這是一條永遠都不變的規則。

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