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121. I was uncertain of my success. Which of the following can replace the underlined word?

A. willing            B. not sure            C. certainly          D. not certainly

121. I was uncertain of my success. Which of the following can replace the underlined word?

A. willing            B. not sure            C. certainly          D. not certainly

121. I was uncertain of my success. Which of the following can replace the underlined word?

A. willing            B. not sure            C. certainly          D. not certainly

121. I was uncertain of my success. Which of the following can replace the underlined word?

A. willing            B. not sure            C. certainly          D. not certainly

121. I was uncertain of my success. Which of the following can replace the underlined word?

A. willing            B. not sure            C. certainly          D. not certainly