面对考研复试中的英语提问，如果你一时无法回答，可以礼貌地用以下几种方式表达：
1. "I apologize, but I'm not sure how to answer that question at the moment. Could you please rephrase it or give me a moment to think about it?"
2. "I'm sorry, that's a bit out of my expertise. I would need some time to research and provide a more informed response."
3. "I appreciate the question, but I'm not certain about the answer. May I have a few minutes to gather my thoughts?"
4. "Thank you for the question. I'm not sure about the exact answer, but I can certainly share my thoughts on the topic."
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