Question

I ________ swim when I saw a sign written by the police that meant children under 18 are not allowed to swim without the adults guidance．

1. A.
   was about to
2. B.
   would
3. C.
   was going to
4. D.
   was to

Answer 1

A
本句的主要意思是“正当我要游泳时，我看到了……”。B、C、D三项都表示过去将来时，但A项表示更近的将来，意思是“正要、即将”，所以选A项。