1.i would have come earlier ,but i ___that you were waiting.
A.didnt know B.hadnt known C,wouldnt know Dhavent known
2.had she found it ,she ____it
A.would have sent B.sent C.should send D.send
3.id rather that you ___right away
A.leave B.left C.should leave D.will leave
4.it was a pity that he ____so careless.
A.is B.was C.should be D .were
1.A 本句是虚拟语气和真实语气的混合，逗号前面那句是虚拟语气，后面那句是真实语气，所以选一般过去时。句意：我要是早知道你在这等我，我就来早一些了，但是我并不知道你一直在等我。事实上我并没有来早，但是不知道你在等我是真实的’。
2.A 逗号前那句其实是if从句，用的是倒装结构，也可以是if she had found it
本句是对过去情况的虚拟，从句用过去完成时，主句用would+have done
3.A would rather 句后用动词原形表示虚拟
4.D it在这里是形式主语，真正的主语是后面的that从句，这也是虚拟语气的一个句型，但是要用过去式表示虚拟,并且be动词一律用were。还有行为动词的比如：Its time you went to bed.
