Food safety is important. Rules ______ to stop people from food pollution.
A．must makeB．must be madeC．can’t makeD．can’t be made
B
被動(dòng)語態(tài)的用法。 本句句意：食品安全很重要，必須制定制度來阻止人們?cè)馐苁称肺廴�；根�?jù)句意應(yīng)該含情態(tài)動(dòng)詞must的被動(dòng)語態(tài)，即must be done。
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