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问几道虚拟语气练习题,请各位解答一下,谢谢

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问几道虚拟语气练习题,请各位解答一下,谢谢
不要只给我答案,最好告诉我为什么,谢谢!
13. You _____ come earlier. The bus left a moment ago.
A. would B. should have C. may D. have
14. He treated me as though/as if _____ his own son.
A. I am B. I would be C. I was D. I were
15. I _____ you some money, but I hadn’t any on me then.
A. would lend B. would have lent C. could lend D. may have lent
13.B
虚拟语气的假设与过去事实相反时,谓语动词:
should/would + have + 过去分词
你本应早些来,但事实是你来晚了
14.D
与现在事实相反时,
动词用一般过去式,be的过去式用were,不管人称区别,是硬性规定
他对待我的态度好象我是他亲儿子似的,但事实是我不是他亲儿子
15.B
与13题解释相同,对过去的虚拟,且与过去事实相反
本应借给你钱,但我当时没钱,事实是我没有借给你钱