2. 外语
  3. Our two senior programmers________each other ever since they were at college.

Our two senior programmers________each other ever since they were at college.

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问题 Our two senior programmers________each other ever since they were at college.
选项 A、know
B、knew
C、have known
D、are knowing
答案C
解析 本题考查动词的时态。当ever since引导时间状语从句时，主句一般使用现在完成时，从句用一般过去时。两个程序员从大学起就认识，一直持续到现在，故用现在完成时，因此确定本题答案为C。know是一般现在时，knew是一般过去时，are knowing是现在进行时，这三种时态都不符合语法要求，均可以排除。
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