Swallows fly to the south before winter ( )1.will come 2.is coming 3.comes 4.is going

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Swallowsflytothesouthbeforewinter()1.willcome2.iscoming3.comes4.isgoingSwallowsflytothesouthbeforewi

Swallows fly to the south before winter ( )1.will come 2.is coming 3.comes 4.is going
Swallows fly to the south before winter ( )
1.will come 2.is coming 3.comes 4.is going

Swallows fly to the south before winter ( )1.will come 2.is coming 3.comes 4.is going
C
表示的是一般性的事,用一般现在时

燕子在冬天来临之前飞往南方 ~|~