It has been too late, __________ (当人们认识到这些食品不安全时).by the time people find that t

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问题 It has been too late, __________ (当人们认识到这些食品不安全时).

选项

答案 by the time people find that the food is not safe

解析 ① by the time+从句表示“当……时”，在此句型中，主句的时态往往用完成时态；② find表示“认识到”；③ food is not safe表示“食品不安全”。

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