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