The students ______ the classroom, so it's tidy and clean now.

题型：单选题题类：模拟题难易度：普通

北京市昌平区2017届九年级下学期英语第二次（5月）模拟考试试卷

A、Clean B、have cleaned C、will clean D、cleans

举一反三

We{#blank#}1{#/blank#} {#blank#}2{#/blank#} cleaning the classroom{#blank#}3{#/blank#}．

—For two days. I _______ here the day before yesterday.

—Yes. There are more buildings than before.

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