If any accident____here tomorrow ,it will be very serious.A happens B will be happened C will happen D is happened选哪个,为什么?

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If any accident____here tomorrow ,it will be very serious.
A happens B will be happened C will happen D is happened
选哪个,为什么?

A happens 主句是将来时,条件状语从句用一般现在时.

A
因为A是正确的

A表示虚拟

A 条件句中一般现在时表示将来