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Experiments in the photography of moving objects______in both the United States and Europe well before 1990.
Experiments in the photography of moving objects______in both the United States and Europe well before 1990.
admin
2018-07-10
66
问题
Experiments in the photography of moving objects______in both the United States and Europe well before 1990.
选项
A、have been conducting
B、were conducting
C、had been conducted
D、are conducted
答案
C
解析
本题是对基本时态和语态的考查。实验是被实施的,所以本题中要用被动语态,其次实验发生在1990年之前,已经是过去完成的事情,因此要用过去完成时,结合选项可知,本题的答案为C。
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