2. 外语
  3. To: Roger Watkins(rwatkins@nex.net) From: Online Shops Unlimited(shop@xec.rrs) Subject: Account security Dear Mr. Watkins, Our r

To: Roger Watkins(rwatkins@nex.net) From: Online Shops Unlimited(shop@xec.rrs) Subject: Account security Dear Mr. Watkins, Our r

admin2016-10-30  28
问题 To: Roger Watkins(rwatkins@nex.net)
From: Online Shops Unlimited(shop@xec.rrs)
Subject: Account security
Dear Mr. Watkins,
Our records show that you tried to recover a【K1】______PIN number on August 30.
Please record your new PIN number and always keep it【K2】______. Remember that your PIN allows access to secure information. If you think someone else knows it, you【K3】______it immediately. Please feel free to call our customer service department with any further questions you might have.
Thank you,
Judy Severn,
Customer Service Director
【K3】
选项 A、should change
B、did change
C、have changed
D、should have changed
答案A
解析 通过分析时态或语义，很容易就能找到该题答案。因为if从句作为单纯条件状语从句提到了今后有可能发生的事情，所以主句不能用过去时态或现在完成时态。因此正确答案是(A)。
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