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考查動詞時態(tài)和主謂一致。句意:他們是在哪里以及是怎樣發(fā)現(xiàn)那些裝滿寶物的船只的,到現(xiàn)在為止還不為人所知。時間狀語up to now (到目前為止)是現(xiàn)在完成時的標(biāo)

志,故排除C、D。由于主語是單個主語從句(where and how they found the boats with treasures),所以謂語動詞用第三人稱單數(shù)。因此選A。

題目來源:2015全品語法快練高中英語新課標(biāo) > 訓(xùn)練16 動詞的時(語)態(tài)和主謂一致

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