_____ their homework,they went to the playground to play footballa.finished b.having finished c.finishing d.to finish为何选B

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_____theirhomework,theywenttotheplaygroundtoplayfootballa.finishedb.havingfinishedc.finishingd.tofin

_____ their homework,they went to the playground to play footballa.finished b.having finished c.finishing d.to finish为何选B
_____ their homework,they went to the playground to play football
a.finished b.having finished
c.finishing d.to finish
为何选B

_____ their homework,they went to the playground to play footballa.finished b.having finished c.finishing d.to finish为何选B
独立主谓结构,主语是they
所以不能用被动语态,
之所以用完成时,是因为后面有描述前面行为所带来的效果,
完成了作业才可以去踢球,产生了影响.
所以选B

已完成所以用ED ing则表状态 前面一整句都是表状态的

Having finished 作伴随状语,表示完成了

a

做完作业后,他们到操场踢球去了.
突出是在作业做完之后,CD排出,B衔接更生动,A不能表示动作先后

完成式啊,他们完成了他们的作业,然后去打篮球啊!!
用排除法也能做出来的:
a作业前和作业后都是过去式,没有时间差,不选
c进行时,他们不可能正在做作业,也去打篮球
d不定时代表将来,将来他们做作业,过去打篮球,也不合逻辑啊
所以应该选B...

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完成式啊,他们完成了他们的作业,然后去打篮球啊!!
用排除法也能做出来的:
a作业前和作业后都是过去式,没有时间差,不选
c进行时,他们不可能正在做作业,也去打篮球
d不定时代表将来,将来他们做作业,过去打篮球,也不合逻辑啊
所以应该选B

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独立主格...
相对于"踢球"而言,"做作业"已经是完成的了.所以用完成时.
他们做完作业后,去操场踢球.

B 对踢球来说,作业已经在这之前完成了

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