我无法回答。
I am ashamed that I could not answer the question.
我很惭愧不能回答这个问题。
The question baffled me completely and I could not answer.
这个问题把我彻底难倒了，我答不出来。
Thee question baffled me completely and I could not answer.
这个问题把我彻底难倒了，我答不出来。
I could not answer it, I tried, but could not frame a sentence.
我无法答复。我试图写回信，可是写不出一个句子。
I could not answer it, I tried, but could not frame a sentence.
我无法答复。我试图写回信，可是写不出一个句子。
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