Question

He_you more help even though he was very busy

He_you more help even though he was very busy.
A,might have given
B.might give
C.may have given
D.may give
想问问这道题为什么选A不选C,我这样想的:句中用了一般过去式,might是may的过去式,其实两项都可以,不过A是更好的答案,在这种情况下选A

Answer 1

may/might have done 都可以表示对过去的事情进行肯定的推测，这里表达的是与过去事实相反的虚拟语气，只能用might+ have done.
这句话意思是“即使他很忙，他也本可以帮助你的”(而事实上他没帮你。)
又如：You may have noticed something while you were doing this task.
He may /might not have received the letter.
但是，might have done还可以意为“推测过去有可能发生但已确知并未发生的事情”。may have done 不能用于此种含义。

希望能帮到你。这个问题很有难度的。加油！

Answer 2

was可以推出的是情态动词+完成式；C的语气强于A,此处是即使他很忙也应该给你更多的帮助，有了埋怨的含义，所以用might.其实你理解的was对应might就没错。

Answer 3

因为这是对过去的情况进行推测, 所以用might. 如果是推测现在或未来, 会用may.