It has been two and a half years _______...

It has been two and a half years _________ we left our primary school.

A. because B. than

C. unless D. Since

D 【解析】试题分析：句意：自从我们小学毕业已经是两年半了。A. Because因为；B. Than比；C. Unless除非；如果不；D. Since自从。本题考查since引导的从句，主语用现在完成时。从句用一般过去时。根据题意故选D。考点：考查连词辨析。

考点分析：

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