Question

Mice ________ a disease which is deadly and ________ quickly．

1. A.
   spreads; spreads
2. B.
   is spreaded ; spreaded
3. C.
   spread; spreads
4. D.
   are spread; spreads

Answer 1

C
主语mice是复数形式，所以谓语不能是第三人称单数形式。第一个空spread为及物动词，第二个空spread为不及物动词。spread的过去式、过去分词和原形一样。