Question

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

Answer 1

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。