2. 专升本
  3. Experiments in the photography of moving objects ______ in both the United States and Europe before 1990.

Experiments in the photography of moving objects ______ in both the United States and Europe before 1990.

admin2019-06-28  49
问题 Experiments in the photography of moving objects ______ in both the United States and Europe before 1990.
选项 A、have been conducting
B、were conducting
C、had been conducted
D、are conducted
答案C
解析 根据句中的时间状语before 1990可知，实验是在1990年以前做的，所以本句应用过去完成时，表示动作发生在“过去的过去”。另外，根据句意可知，experiments和conduct为逻辑上的动宾关系，所以应用被动语态。故选C。
转载请注明原文地址:https://www.kaotiyun.com/show/9RDC777K
本试题收录于： 英语题库普高专升本分类
0

英语

普高专升本

相关试题推荐
随机试题
最新回复(0)