Question

Tom always feels it necessary that he ________English.

1. A.
   learns
2. B.
   would have learned
3. C.
   learn
4. D.
   were to learn

Answer 1

C
考查虚拟语气。Necessary后面的句子使用虚拟语气，用(should)+动词原形构成。Should可以省略，故C正确。