题目内容
— Bob, why do you stay silent? Can you tell me the answer?
— I'm sorry, Mr. Green. Your question is very difficult ________.
— I'm sorry, Mr. Green. Your question is very difficult ________.
[ ]
A. to be answered
B. to answer
C. answering
D. to have answered
B. to answer
C. answering
D. to have answered
B
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