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题型：语法填空（单句） 题类：常考题 难易度：普通
北师大版英语九年级全册 Unit 2 Books. Lesson 6 Tom Sawyer.同步练习
— Because most of the earth's surface by water.
Much research work{#blank#}1{#/blank#} in many fields of science every year.
— Of course. It ______________ every day.
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