Lesson 21Sending an E-mailsend v. 发送e-mail n. 电子邮件straight adv./ adj. 直的per prep. 每…paper n. 纸again adv....
LessonEightSendingaLetterHomeA.词汇1.agoadv.以前,用于一段时间后,后常跟过去时连用。如：threeyearsago,三年前,afewdaysago,几天前,而be...
