1.A sinc 连的句子要用过去式,主句用一现在时,或用现在完成时.即it is /it has been +time +since...2.D.since意为“既然” 后一个空,do you think 是插入语.3.A.表示感兴趣的表情4.A 表示我们动的时候,坏了,表动作5...
1+ how long it is _________we visited your mother?A since B
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