All preparations ___,they started the experiment.
All preparations ___,they started the experiment.
A.having been made B.made C.being made D.to make
选哪个,为什么?请从语法和语境两个角度进行分析.
all preparation having been made中，为什么出现having?
语法结构中怎么理解，语境中又该怎么理解？
A.having been made B.made C.being made D.to make
选哪个,为什么?请从语法和语境两个角度进行分析.
all preparation having been made中，为什么出现having?
语法结构中怎么理解，语境中又该怎么理解？
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