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Experiments in the photography of moving objects ________ in both the United States and Europe well before 1990.
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学位英语(x0001)
发表:2024年07月31日 06时07分50秒
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Experiments in the photography of moving objects ________ in both the United States and Europe well before 1990.
A、 have been conducting
B、 were conducting
C、 had been conducted
D、 are conducted
【正确答案】:C
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