2. 专升本
  3. It______ exactly thirty year since I graduated from college.

It______ exactly thirty year since I graduated from college.

admin2015-09-05  25
问题 It______ exactly thirty year since I graduated from college.
选项 A、was
B、has been
C、was be
D、had been
答案B
解析 since引导的状语从句，表示主句中的动作或状态从过去某个时间开始一直持续到现在，故用完成时态，“It has been…”。
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