If we __________ careful，fire can be dangerous。

        A．don’t be         B．a(chǎn)re            C．a(chǎn)ren’t            D. won’t be

 

【答案】

C

【解析】if引導(dǎo)的條件狀語從句要用一般現(xiàn)在時(shí)。

 

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