高中英语情态动词用法
Here is a dictionary in case you --it
A,should use B,need 为什么是b啊?虚拟语气的should一定得省略吗?
He said he would ring me up ,but he did not --my telephone number?
A,MUST HE FORGOTTEN B,COULD HE HAVE FORGOTTEN
为什么是B啊,选B的话,could have done something 不是只有{本来可以···而实际上却···}的用法吗?