一生无悔广场舞16步分解动作:Modern transportation made _____ travelling throughout the world in a few week

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A.it possible
B.possible
C.that possible
D.possible of

选哪个?为什么?

选A.
it 是代宾语,即travelling throughout the world in a few week.用it 可以使结构不至于显得太重,这是习惯用法

A.it possible

A