though i am supposed to know him well,i cann't understand him_ like thata.behavingb.to behavec.behaved.be behaving

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though i am supposed to know him well,i cann't understand him_ like thata.behavingb.to behavec.behaved.be behaving

though i am supposed to know him well,i cann't understand him_ like thata.behavingb.to behavec.behaved.be behaving
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

though i am supposed to know him well,i cann't understand him_ like thata.behavingb.to behavec.behaved.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 (+ - - - -).

句意:虽然我应该知道他,但我无法理解他那样.
答案:B.

A