摘要： Professor Hawking stepped into the office I knew that there was no hope. A. Unless B. Now that C. Although D. The moment
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Professor Hawking stepped into the office I knew that there was no hope.
A. Unless B. Now that
C. Although D. The moment
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________ Professor Hawking stepped into the office I knew that there was no hope．
[ ]
A．Unless
B．Now that
C．Although
D．The moment