however,for those in situation------these two optians are not available
填where
因为【situation】在从句中作状语
【these two optians are not available in this situation】,所以用where
that是做主语和宾语的时候用的
however,for those in situation------these two optians are not available
填where
因为【situation】在从句中作状语
【these two optians are not available in this situation】,所以用where
that是做主语和宾语的时候用的