Question

We ______ to close the windows before we left the lab.

1. A.
   tell
2. B.
   told
3. C.
   are told
4. D.
   were told

Answer 1

D
考查被动语态的用法。被动语态的结构形式为：be+过去分词，因此可排除A、B。由时间状语可知，本句用过去时态，故选D。