Supplement

Learning these terms will improve your English

作者：21ST

sign up (for): to register (for), to enroll (in)Grammar/usage notes: People who cannot sign up for themselves become the object of the verb. In this case the idiom is separable and is often use...

点击阅读全文

对本期电子报订户、有效期内的VIP教师会员和本学期二十一世纪英文报尊享卡用户，我们开放所有内容：
如果您拥有以上权限，请点这里登录；
订阅电子报，请点这里；
激活VIP教师卡，请点这里；
激活21英语尊享卡，请点这里。