my parents ()at home.a.are both b.are all c.all are d.both are请问为什么选a,bc中有all错哪.be动词放哪

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my parents ()at home.a.are both b.are all c.all are d.both are请问为什么选a,bc中有all错哪.be动词放哪
my parents ()at home.a.are both b.are all c.all are d.both are
请问为什么选a,bc中有all错哪.be动词放哪

my parents ()at home.a.are both b.are all c.all are d.both are请问为什么选a,bc中有all错哪.be动词放哪
both和all都是“都”的意思,但是all是三人以上时使用,两人时用both