Alotoftrees

问题详情：

 A lot of trees ______ on the hill yesterday.

  A. are planted         B. will be planted        C. have been planted  D. were planted

【回答】

 D

解析:考查被动语态。由时间状语yesterday可知，用一般过去时，由trees和plant构成被动关系，用一般过时的被动语态

知识点：动词时态

题型：选择题