问题补充：
He you more help even though he was very busy.
A. might have given
B. might give
C. may have given
D. may give
答案：
(答案→)A. might have given
B. might give
C. may have given
D. may give
解析：考查虚拟语气：“might have done”可以用来表示“本来有可能做某事，事实上却没做”，表达一种婉转的批评或责备。本题是说“他即使很忙也可能帮助你的（但实际上却并没有）”。因为是谈论过去的事情，情态动词应与不定式的完成式连用，排除B和D。C是对过去事实的推测，与后文不符。选A.
