Question

She ______ to bed when the earthquake suddenly started. That was why she was just in her bed clothes.

1. A.
   was to go
2. B.
   went
3. C.
   had gone
4. D.
   would to

Answer 1

A
句中when对答案有明显的暗示作用，它与选项构成“正打算做……突然……”句型。四个选项中唯有be to do才能与when搭配。