问题
选择题
_____ in London, he was eager to see the Big Ben. [ ]
A. To his arriving
B. Once his arrival
C. Upon his arrival
D. The moment arrived
答案
答案：C
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_____ in London, he was eager to see the Big Ben. [ ]
A. To his arriving
B. Once his arrival
C. Upon his arrival
D. The moment arrived
答案：C