◎ 题干
She was joyful ________ seeing her son take his first steps.
[     ]
A. as
B. upon
C. immediately
D. as soon as
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“She was joyful ________ seeing her son take his first steps.[ ]A. as B. uponC. immediately D. as soon as …”主要考查了你对  【介词和介词短语】  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。