问题
选择题
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
答案
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。