[单选题]题目26未回答满分1.00未标记标记题目. Experiments in the photography of moving objects ________ in both the United States and Europe well before 1990.
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[单选题]题目26未回答满分1.00未标记标记题目. Experiments in the photography of moving objects ________ in both the United States and Europe well before 1990.

a. when
b. what
c. where
d. which
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