题型：语法填空（单句）题类：难易度：普通

（初中必刷题）沪教版七年级下册Unit 3 Trees and us Section 2 Grammar 课时同步训练

It's 9 o'clock.The students (have) a lesson at school.

举一反三

There are some chemical factories {#blank#}1{#/blank#} waste water {#blank#}2{#/blank#} the river.

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