◎ 题干
A good idea occurred to Mr. Baker________ to his invention recently. 
[     ]
A. while applying
B. while applied
C. while he was applying himself
D. while applying himself
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“A good idea occurred to Mr. Baker________ to his invention recently. [ ]A. while applyingB. while appliedC. while he was applying himselfD. while applying …”主要考查了你对  【并列连词】  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。