emmahiggins09 发表于 2016-4-11 08:06
could have done 前面要是 had done 才行。现在D选项是现在进行时,could be 就足够了 ...
460226813 发表于 2016-4-11 13:56
谢谢啦 还有个问题,你的意思是说 could have bought描述的是过去的事。 但是 could be bought说的是现 ...
emmahiggins09 发表于 2016-4-11 16:49
这是考时态的和谐性的题目,举个例子:
现在时就是if I were you, I would do blahblah...前面的从句部 ...
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