— Bob, why do you stay silent? Can you tell me the answer?— I'm sorry, Mr. Green. Your question is very difficult _______

◎ 题干

— Bob, why do you stay silent? Can you tell me the answer?
— I'm sorry, Mr. Green. Your question is very difficult ________.

[ ]

A. to be answered
B. to answer
C. answering
D. to have answered

◎ 答案

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◎ 解析

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◎ 知识点

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