【題目】Unless people take action________ once, the environmental problem will be more serious.

【答案】at

【解析】

句意為：除非人們________采取行動(dòng)，否則環(huán)境問題會(huì)更加嚴(yán)重。at once立刻，馬上，為固定短語(yǔ)，故填at。

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