Question

Yesterday it rained heavily when school was over. We ________ stay in our classroom

1. A.
   should
2. B.
   must
3. C.
   had to
4. D.
   has to

Answer 1

C
解析：
点拨：此题考查情态动词。句意为：昨天放学时正在下大雨，我们不得不呆在我们教室里。强调外界因素的“必须”用have to，强调内在因素用must。