our dog,Rex,____(sit)outside our front gate and bark.应该把sit写

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our dog,Rex,____(sit)outside our front gate and bark.应该把sit写成什么形式
在说出为什么这样填，根据什么语法形式

我觉得最好是填 is（was) sitting
但后面的bark 似乎不对啊,要不就是barks,一般现在时的三单,这时就用is sitting；或者用过去时的barked,这时就用was sitting
意思是：我们的狗Rex,正坐在前门外面叫.
sit 是一个持续性的动词,一般在没有时间状语的情况下,这种动词用一般现在时,那是强调这个动作,假如用现在进行时,强调的是状态.我感觉这里应该是强调“坐”的状态,所以用现在进行时比用过去时更佳.

our dog,Rex,____(sit)outside our front gate and bark.应该把sit写 our dog,rex,used to sit outside our front gate and bark.为什么b Our dog ,Rex ,used to sit outside our front gate and bark .E I used to sit outside our front gate.这句话中 outside 是名词还是形容词,还 and ______?outside our school gate In front of our school gate ____ two stone lions I CAN'T SIT ON OUR Our dog always _____ （bark） at strangers. we should give our ______ to the old men and women.(sit) Let's sit down and put our heads together.We have to _______ 翻译They sit and sit. we met— 9 o'clock outside our school gate