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题型：语法填空（单句） 题类：常考题 难易度：普通
冀教版初中英语八年级上册Unit 4 Lesson 21 Eat a donut and turn right同步练习
—Good idea. It must be fun.
— I am due to return it in two weeks.
—I'm not sure. If he ______ I'll call you as soon as possible.
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