Tom has lived in Shanghai____three years ago.A for B.since C.before D./

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TomhaslivedinShanghai____threeyearsago.AforB.sinceC.beforeD./TomhaslivedinShanghai____threeyearsago.

Tom has lived in Shanghai____three years ago.A for B.since C.before D./
Tom has lived in Shanghai____three years ago.
A for B.since C.before D./

Tom has lived in Shanghai____three years ago.A for B.since C.before D./
选B.since
这是一句现在完成时
现在完成时的标志有:
①since + 过去时句子
It has been three years since you left.(你已经离开三年了.)
②since + 一点时间
Tom has lived in Shanghai since three years ago.(从三年前起,Tom就居住在上海了.)
③for + 一段时间
Tom has lived in Shanghai for three years.(Tom在上海已经住了三年了.)
④already多用于肯定陈述句中,其位置比较活跃,通常放在 have/has与过去分词之间
Jane has already moved away.(Jane早已经搬走了.)
⑤never本身否定,多用于否定陈述句中
I have never been here.(我从来没来过这儿.)
⑥ever多用于疑问句中,问初次经历
Have you ever loved somebody so much?(你是否曾经深深地爱着一个人?这是我很喜欢的Westlife的“have you ever”中一句歌词,拿来当例句啦~)
这些标志比较普遍,还有just“刚刚”(多用于助动词have/has与实义动词之间); yet“还,仍然”(用于否定句和疑问句中,置于句末);before“以前”(一般位于句末,独立用),有的时候也会出现~