题目：
多选题
Advantages of e-mail writing:
- A. When writing through e-mail， students have a feeling of real-time writing.
- B. E-mail provides a perfect mechanism for students to submit drafts and for teachers to look them over at their convenience and send them back with comments -- once， twice，or several times.
- C. In an e-mail based writing scheme， the students can not only send their writing to the teacher， they can also send their work to each other simultaneously.
- D. The teacher can easily store all the drafts of a document for later review and analysis of the revision process
答案：
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