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Experiments in the photography of moving objects______in both the United States
Experiments in the photography of moving objects______in both the United States
游客
2023-10-20
30
管理
问题
Experiments in the photography of moving objects______in both the United States and Europe well before 1900.
选项
A、were conducting
B、have been conducting
C、had been conducted
D、had conducted
答案
C
解析
由后面的时间可知应填过去时态,而“before+时间”通常与完成时连用。
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