◎ 题干

.He is really incompetent! The letter ______ yesterday.
a. should be finished typing    b. must be finished typing
c.must have finished typing    d. should have been finished typing
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“.He is really incompetent! The letter ______ yesterday.a. should be finished typing b. must be finished typingc.must have finished typing d. should have be…”主要考查了你对  【虚拟语气】【情态动词】  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。