问题补充:
My English teacher insisted that the exercises very difficult and that we them carefully.
A. were; must finish
B. be; finish
C. were; finish
D. be; finished
答案:
A. were; must finish
B. be; finish
(答案→)C. were; finish
D. be; finished
解析:根据句子结构可知,and前的部分表述的是观点,故用一般过去时;第二空表达的是建议,故用should+动词原形的形式,should被省略。句意:我的英语老师坚持认为这些练习很难,我们应该认真完成它们。