Swallows fly to the south before winter _____ .A.will come B.is coming D.is going to come

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Swallows fly to the south before winter _____ .A.will come B.is coming D.is going to come
Swallows fly to the south before winter _____ .A.will come B.is coming D.is going to come

Swallows fly to the south before winter _____ .A.will come B.is coming D.is going to come
B
因为这里现在进行时表将来.

b