选适当的be动词填空：this ----a cow.those ---dogs.
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选适当的be动词填空：this----acow.those---dogs.选适当的be动词填空：this----acow.those---dogs.选适当的be动词填空：this----acow.th
选适当的be动词填空：this ----a cow.those ---dogs.
选适当的be动词填空：this ----a cow.those ---dogs.
选适当的be动词填空：this ----a cow.those ---dogs.
this -is ---a cow.those -are--dogs
is are
应该是is are
is are
this is a cow , those are dogs
一般this 后面用is
those 后面用are
选适当的be动词填空：this ----a cow.those ---dogs.
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用动词的适当形式填空时,怎么判断用BE动词,还是用情态动词
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