The philosophy class began with twenty students but three _____ after the mid-term exam.

A. picked up                   B. turned out      C. dropped out       D. kept up

The philosophy class began with twenty students but three ________ after the mid-term exam．

1. A.
   picked up
2. B.
   turned out
3. C.
   dropped out
4. D.
   kept up

（2010·湖南株洲二中高三上第三次月考）      28．The philosophy class began with twenty students but three _____ after the mid-term exam.

A. picked up   B. turned out C. dropped out       D. kept up