Once upon a time，a(n)________famous scientist said that life was not easy for any of us but first of all we should believe in ourselves.
| A．another | B．sure |
| C．some | D．certain |
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Once upon a time，a(n)________famous scientist said that life was not easy for any of us but first of all we should believe in ourselves.
| A．another | B．sure |
| C．some | D．certain |
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