15．By the 10century，Old English         the official language of English．（　�。�
A．has becomeB．becameC．had becomeD．would become

分析 考查過去完成時(shí)態(tài)，句意：到十世紀(jì)時(shí)，古英語已經(jīng)成為英語的官方語言．

解答 答案C，by后跟過去的時(shí)間，用過去完成時(shí)態(tài)，指截止到過去某一時(shí)間前發(fā)生的事情，所以選C，A選項(xiàng)指截止到現(xiàn)在發(fā)生的事，B選項(xiàng)是過去發(fā)生的事，D，是過去將會(huì)發(fā)生的事．

點(diǎn)評(píng) by后跟過去的時(shí)間，用過去完成時(shí)態(tài)，by now，用現(xiàn)在完成時(shí)態(tài)，by后跟將來時(shí)間，用將來完成時(shí)態(tài)．

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