1.i would have come earlier ,but i ___that you were waiting.
t know t known C,wouldnt know Dhavent known
she found it ,she ____it
d have sent ld send
rather that you ___right away
e ld leave leave
was a pity that he ____so careless.
ld be D
1.A 本句是虛擬語氣和真實語氣的混合，逗號前面那句是虛擬語氣，後面那句是真實語氣，所以選一般過去時。句意：(我要是早知道你在這等我，)我就來早一些了，但是我並不知道你一直在等我。事實上我並沒有來早，但是不知道你在等我是真實的。
2.A 逗號前那句其實是if從句，用的'是倒裝結構，也可以是if she had found it
本句是對過去情況的虛擬，從句用過去完成時，主句用would+have done
3.A would rather 句後用動詞原形表示虛擬
4.D it在這裏是形式主語，真正的主語是後面的that從句，這也是虛擬語氣的一個句型，但是要用過去式表示虛擬,並且be動詞一律用were。還有行爲動詞的比如：Its time you went to bed.
