分类：教育/科学-外语学习
问题：高二英语oneoftheguardswhenthegeneral 
one of the guards      when the general came in,which made him very angry.A.has slept B.were sleeping                     .slept D.was sleeping
回答：one of the guards____D.was sleeping ____ when the general came in,
which made him very angry.
A.has slept B.were sleeping C.slept D.was sleeping 
空格 在guards后, 前边是one of 所以用单数,