◎ 题干
--- We'll visit the Summer Palace_______ there is a heavy rain tomorrow.
--- OK !  Boating on the lake must be interesting.
A.unlessB.sinceC.untilD.if
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“--- We'll visit the Summer Palace_______ there is a heavy rain tomorrow. --- OK ! Boating on the lake must be interesting.A.unlessB.sinceC.untilD.if…”主要考查了你对  【助动词】【介词短语】【固定搭配】【疑问词组】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。