Was it 80 years before Christopher Columbus crossed the Atlantic ______ Zheng He hadsailed to East Africa?
A．whenB．thatC．a(chǎn)fterD．since
B

試題分析：考查強(qiáng)調(diào)句型。句意：在哥倫布橫跨大西洋80年前鄭和已經(jīng)航行到達(dá)東非了。本題是強(qiáng)調(diào)句型，首先要知道強(qiáng)調(diào)句的結(jié)構(gòu)：It is/was+被強(qiáng)調(diào)部分+that/who+句子的其他成分，如果被強(qiáng)調(diào)的部分是人，可以用who代替that。強(qiáng)調(diào)句的用法及判斷：如果把句子中的It is/was…that去掉，稍加調(diào)整語(yǔ)序，能還原成完整的句子，并且句子意思依然完整，則為強(qiáng)調(diào)句型，否則為其他從句。本句強(qiáng)調(diào)的是時(shí)間狀語(yǔ)80 years before Christopher Columbus crossed the Atlantic。故B正確。
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