问题
选择题
The agent was about to sign his name to the document ________，to our surprise，a stranger broke in to prevent him.
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答案
B
解析 when此处为并列连词，相当于at that time，可译为“这时(突然)……”。
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The agent was about to sign his name to the document ________，to our surprise，a stranger broke in to prevent him.
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