Edison was a clever boy, and ______ he was fourteen, he had learned advance math
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Edison was a clever boy, and ______ he was fourteen, he had learned advance mathematics by himself. A.whenever | B.by the time | C.the moment | D.ever since |
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答案
B |
解析
考察时态。By the time到…时为止;根据he had learned advance mathematics by himself中的过去完成时,可知所选择的连词是与完成时连用的,结合句意可知B正确。句意:爱迪生是一个聪明的孩子。到他14岁的时候,他已经自学了高等数学。 |
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