The ratio of male birth fell to 0.82 boys to every girl among couples______
both mother and father smoked more than 20 cigarettes a day
which
that
whom
where
에서 답이 where 라는데요 잘 이해가 가지 않습니다
왜 that 이 안되는 건가요??

The ratio of male birth fell to 0.82 boys to every girl among couples______
both mother and father smoked more than 20 cigarettes a day
which
that
whom
where
에서 답이 where 라는데요 잘 이해가 가지 않습니다
왜 that 이 안되는 건가요??
