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10. Where  and how they found  the  boats with treasures     made known up to now.

A. hasn't been    B. haven't been

C. wasn't      D. weren't

10.   A考查动词时态和主谓一致。句意:他们是在哪里以及是怎样发现那些装满宝物的船只的,到现在为止还不为人所知。时间状语up to now (到目前为止)是现在完成时的标

志,故排除C、D。由于主语是单个主语从句(where and how they found the boats with treasures),所以谓语动词用第三人称单数。因此选A。

题目来源:2015全品语法快练高中英语新课标 > 训练16 动词的时(语)态和主谓一致

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