本題答案為 B.from where .
from where 引導(dǎo)非限制性定語從句,其先行詞是以地點(diǎn)名詞the window為中心的前面的一句話.意指 from the place wherethe man was standing.
當(dāng)先行詞是以地點(diǎn)名詞或者時(shí)間名詞為中心的一句話時(shí),定語從句由“介詞+where”或者“介詞+when”.其中,when=which place,when=which time.
當(dāng)先行詞是地點(diǎn)名詞或者時(shí)間名詞,并且,它們作介詞賓語在定語從句中作地點(diǎn)或者時(shí)間狀語時(shí),定語從句由where或者when引導(dǎo),相當(dāng)于“介詞+which”.
比較：
① He stood at the window,____ he could see what was happening.
A.from where B.from which C.which D.at which、
② The southern states wanted to set up a country of their own,where/in which they would be free to keep black slaves．