Question

Tom insisted that I ________ off his debts within two weeks．

1. A.
   pays
2. B.
   paid
3. C.
   should pay
4. D.
   had paid

Answer 1

C
句中的insist的意思为“坚决主张”，后面从句的谓语动词常用should do sth．结构，其中should可以省略。