Question

Yue Cuixi ________ one of women pilots to take part in the experiments to make sure the re-entry capsule（返回艙）can land safely.

1. A.
   used to be
2. B.
   used to being
3. C.
   is used to be
4. D.
   was used to be

Answer 1

A
used to加不定式表示過(guò)去常常干某事，現(xiàn)在不再干了。