since 和so far

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since 和so far
：§ I have been working in this school since my graduation .§ Oh ,I see .You have taught nowhere else ( A ).A.since B.so far C.ago D.already 为什么不是B ,怎么是A

so far 到目前为止
since 自XX开始
ago XX以前
already 已经
从题意上看是,我一直在这所学校工作自从我毕业以后.所以应该选择 A since

since 和so far so far 和so hard since then和so since用于什么时态 so far用于什么时态 so far as 和as far as的区别 so far FAR TOO和SO MUCH的区别 so long as和as far so far 和 till now的区别? 单项选择,要详解 since you have come so far with your exp Since we have not resolved this problem so far,we need to ad Since our research so far has not produced any answers to th