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You ____be careful with fire when you have a picnic in the forest. It’s too dangerous.

A．will

B．must

C．can

D．may

You ________ be careful with fire when you have a picnic in the forest. It's too dangerous. (29安徽市)

[　　]

You ________ be careful with fire when you have a picnic in the forest. It's too dangerous.

[　　]

A．will

B．must

C．can

D．may