It is strongly remended that the machine_____________ every year.A.are checkedB.should checkC.checkedD.be checked
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D解析试题分析：It + be + remended + that从句结构中，that从句应用“ should + 动词原形”，其中should可省略,故选D。考点：从句中的虚拟语气的考查
点评：It + be + 动词的过去分词 + that从句ordered, suggested ,advised, requested, demanded, advised , required , insisted…)，that从句应用“ should + 动词原形”，其中should可省略的虚拟语气。