It is so sad that this harbor，which is home to various lives as the Earth's air conditioner，
is being threatened
is being threatened
（threaten） by a big fire now. （所给词的适当形式填空）

【答案】is being threatened

【解答】

【点评】

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发布：2024/6/26 8:0:9组卷：5引用：2难度：0.8

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It is so sad that this harbor，which is home to various lives as the Earth's air conditioner， is being threatenedis being threatened （threaten） by a big fire now. （所给词的适当形式填空）