If nature does not provide man with the necessary material,it is the laboratory ____ he will turnto for it．\x05 \x05A．where\x05B．that\x05C．which\x05D．what为什么不能选where

If nature does not provide man with the necessary material,it is the laboratory ____ he will turn
to for it．\x05
\x05A．where\x05B．that\x05C．which\x05D．what
为什么不能选where

因为turn后面有to了.where= to which