用can 或able to正确形式填空.You________not leave this room until you get permission.
问题描述：
用can 或able to正确形式填空.
You________not leave this room until you get permission.
答
able to
able to表示一个动作，而can表示一种可能
答
CAN'T确定
答
can
答
can't
答
用can,因为able to 前面必须有be 动词,构成句型be able to.但句中没有,所以用can.
答
cant't
are not able to
not until形式,直到....才....
can=be able to