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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
2009-01-13
58
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
该题测试考生的基本时态和语态概念。首先,这道题必须是被动语态。其次,试验是在1990年之前做的,所以必须用过去完成时态。
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