题型：单选题题类：难易度：普通

上海市闵行区（五四学制）2020-2021学年六年级上学期英语期末试卷

We____ chase each other in the classroom. That's our class rule.

A、must B、mustn't C、may D、may not

举一反三

We {#blank#}1{#/blank#} use the lift {#blank#}2{#/blank#} the escalator.

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