This is such a difficult problem that all of us can't work it out.这一句中有it,宾语存在用that
This is such a difficult problem as all of us can't work out.这一句无宾语it,用as.
解这类题的关键是看后面有没有差宾语,如差,则用such as 否则用such that
This is such a difficult problem that all of us can't work it out.这一句中有it,宾语存在用that
This is such a difficult problem as all of us can't work out.这一句无宾语it,用as.
解这类题的关键是看后面有没有差宾语,如差,则用such as 否则用such that