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56.

If John had entered the office ten minutes ago, he____ what we were talking about just now.

• A、should know
• B、had known
• C、would know
• D、would have known

Writing: For this part, you are supposed to write an e-mail in about 100 - 120 words based on the following situation. Remember to write it clearly.

你(Li Yuan)下周一因为要去参加演讲比赛，不能上外教(Prof.Smith)的写作课。请给他写一封e-mail，内容包括:

·请假并表示歉意；

·解释不能上课的原因，如比赛的重要性；

·承诺会自学所缺内容并按时交作业；

·祝他偷快。