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
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