问题
选择题
Hi, Bob. How are you doing? It has been a long time _____ we left our junior middle school.
A．when
B．that
C．before
D．since
答案
答案：D
题目分析：此处主句是现在完成时，从句是一般过去时，所以选since。句意：Bob你过得怎么样？自从我们初中毕业很长时间了。
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