问题
选择题
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
答案：C
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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：C