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【题目】Officers in the WHO once said only 1. 5 grams of salt ________needfor each man every day.

【答案】is needed

【解析】

句意:世卫组织官员曾说,每人每天只需要1.5克盐。

根据句意理解及句子结构分析可知,这里句子的主语是salt,与谓语动词need之间是表示被动关系,所以这里应该用被动结构,而句中时间是every day,所以谓语动词用一般现在时的被动,结构是“am/ is/ are+过去分词”,主语是不可数名词,所以这里应该用is,故答案为is needed

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