◎ 题干
Helen ______ her keys in the office so she had to wait until her husband ______ home.
A.has left; comes B.left; had come
C.had left; cameD.had left; would come
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“Helen ______ her keys in the office so she had to wait until her husband ______ home. A.has left; comes B.left; had come C.had left; cameD.had left; would c…”主要考查了你对  【一般现在时】【将来进行时】【过去完成进行时】【过去将来时的被动语态】  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。