experiments in the photography of moviobjects__experiments in the photography of moving objects__in both the united states and europe well before 1900A being conductedB have been conductingC were conductionD hava been conducted可以顺便解释下
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![experiments in the photography of moviobjects__experiments in the photography of moving objects__in both the united states and europe well before 1900A being conductedB have been conductingC were conductionD hava been conducted可以顺便解释下](/uploads/image/z/10666601-17-1.jpg?t=experiments+in+the+photography+of+moviobjects__experiments+in+the+photography+of+moving+objects__in+both+the+united+states+and+europe+well+before+1900A+being+conductedB+have+been+conductingC+were+conductionD+hava+been+conducted%E5%8F%AF%E4%BB%A5%E9%A1%BA%E4%BE%BF%E8%A7%A3%E9%87%8A%E4%B8%8B)
experiments in the photography of moviobjects__experiments in the photography of moving objects__in both the united states and europe well before 1900A being conductedB have been conductingC were conductionD hava been conducted可以顺便解释下
experiments in the photography of moviobjects__
experiments in the photography of moving objects__in both the united states and europe well before 1900
A being conducted
B have been conducting
C were conduction
D hava been conducted
可以顺便解释下为什么么?谢谢
experiments in the photography of moviobjects__experiments in the photography of moving objects__in both the united states and europe well before 1900A being conductedB have been conductingC were conductionD hava been conducted可以顺便解释下
D hava been conducted
因为是过去完成时,且是被动式.
D ,已经被执行的意思