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    【题目】It was 80 years before Christopher Columbus crossed the Atlantic______Zheng sailed to East Africa

    A.when B.that C.after D.since

    【答案】

    【解析】试题分析：考查强调句。句子虽然比较长，但是其主干为强调句型，是对“80 years before Christopher Columbus crossed the Atlantic”进行了强调，由此可知，空白处应该填写“that”。故选B。

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