More wild tigers have been seen in the forest around this area, there used to be
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More wild tigers have been seen in the forest around this area, ____ there used to be very few.
A.when
B.where
C.what
D.which
试题答案
B
定语从句缺少地点状语in the forest，所以其关系词必须是where或in which.答案A在定语从句中做时间状语； C what不能引导定语从句； D的which只能直接代替先行词the forest，但是它不能在该定语从句中直接充当成分。