it is up to sb to do
请问,It is up to sb.to do sth.
be up to do be up to doing be up to sb to do sth it is up to
it is up to sb for sth 还是to do sh?
it's up to sb.to do sth.
It is typical of sb.to do
it is 形容词 for sb.to do
it is +形容词+for sb to do.
it is+形容词+for sb+to do
it is adj.of sb.to do sth.it is adj.from sb.to do sth.
it is adj of sb to do与it is adj for sb to do区别
it is...for sb.to do...和it is...of sb.to do...的用法
"It is+adj.+to+sb.+to do sth." 和 “It is + adj.+for +sb.+to d