试题 试卷
题型：单选题 题类：模拟题 难易度：普通
吉林省松原市2019届九年级下学期宁江区第三次模拟考试试卷
—It________be Jack.He has gone to Beijing.
—It's 8:30 a. m. He {#blank#}1{#/blank#} (must／can) be at school having classes.
—Yes, that's true.
—I'm not sure. He be playing football on the playground.
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