18. It is ______ that he has passed the examination, and I am _____ I will pass it too.
| A．certain; certain | B．certain; sure |
| C．sure; certainly | D．certainly; surely |
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18. It is ______ that he has passed the examination, and I am _____ I will pass it too.
| A．certain; certain | B．certain; sure |
| C．sure; certainly | D．certainly; surely |
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