though i am supposed to know him well,i cann't understand hi

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though i am supposed to know him well,i cann't understand him_ like that
a.behaving
b.to behave
c.behave
d.be behaving

答案是A
语法：
1 understand (sb's) doing sth
understand + 动名词 ------i cann't understand him doing ==i cann't understand his doing - - - -
2 understand + what / how / when - - + to + 动词原形
3 understand + when / how / why + 主语+ 谓语（+ - - - -）.

though i am supposed to know him well,i cann't understand hi 让步状语填空I don't know him well though _________随便填啥 I don't know him well enough. how am i supposed to know a thing like that? I am never supposed to encounter a girl like you,I know I am i cann't answer,because i really don't know. i cann\'t answer,because i really don\'t know. I am afraid I cann't go to the party tomorrow.哪错了?为什么? I understand,but,I don't know what to do? I am never supposed to encounter a girl like you, I know I a i cann't you I cann\'t wait.