作业帮It___ten years since he left the army.A.is B.has C.will D.wa
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It___ten years since he left the army.A.is B.has C.will D.was 这题应该怎么选?
正确答案是A,这里也可以填has been.is比较口语化,而填has been比较正式一点,因为句子中有since引导一个过去时的句子,主句应该用现在完成时.两者都是正确的,可以互相转换.该句子可以做如下转换：
He left the army ten years ago.
=It has been ten years since he left the army.
=It is ten years since he left the army.
=Ten years has passed since he left the army.
He left the army ten years ago.
=It has been ten years since he left the army.
=It is ten years since he left the army.
=Ten years has passed since he left the army.
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