问题补充:
In order to meet the deadline, Professor Smith along with his assistantsthe project day and night.
A. work on
B. works at
C. is working on
D. are working on
答案:
A. work on
B. works at
(答案→)C. is working on
D. are working on
解析:考查词组和主谓一致。A. work on从事,忙于,B. works at致力于,因为主语由along with,连接时,其谓语动词的单复数形式通常由前面的词来决定。就是Professor Smith故用单数谓语,在BC里面选择,句意:为了如期完成,斯密斯教授和他的助手日夜忙着这个项目。答案为C项。