Question

The boy burst into tears ________ he saw his mother

1. A.
   at the moment
2. B.
   in a moment
3. C.
   for a moment
4. D.
   the moment

Answer 1

D
考查连词短语。句中the moment为连词短语，表示“一……就……”，其它短语只可作状语，故选D。