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 (+ - - - -).
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 (+ - - - -).
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