句型：
It is +一段時間+since...意思是“自.發(fā)生以來已經(jīng)一段時間了”.后邊用一般過去時
如：
it is three years since he died.(自)他去世以來已經(jīng)三年了.
而你的A屬于另外一種
即：since 引導的從句,主句用現(xiàn)在完成時,從句用一般過去時!從句就是since后邊的句子.
如：
He has studied very hard since he came to our school.
自從他來到我們學校,他學習就非常努力.
注意這個和：He has been a teacher since 1999.仔細觀察哦,這個是簡單句
It's four years since Mike ____ to Tibet.A.has been B.is coming C.will come D.came
It's four years since Mike ____ to Tibet.A.has been B.is coming C.will come D.came
為什么不是A呢
為什么不是A呢
英語人氣：983 ℃時間：2020-04-03 04:45:20
優(yōu)質(zhì)解答
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