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题型：单选题 题类：常考题 难易度：普通
河北省枣强县2020届九年级上学期英语期末考试试卷
点拨：{#blank#}1{#/blank#}意为"除非，如果不"，引导条件状语从句，这是否定的含义，相当于{#blank#}2{#/blank#}。如：
My sister never cries unless she is hungry. ＝{#blank#}3{#/blank#}
—Yes. But if it _____, I_____ at home.
—Excuse me, I wonder {#blank#}1{#/blank#} the plane can land on time.
—Wait a minute, please. Let me check it out.
I don't know {#blank#}1{#/blank#} or not they will come to help us.
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