题文
After pains-taking efforts, he eventually concluded that the principle he stuck _______ true.
| A．to proved | B．to proving |
| C．to be proved | D．to being proved |
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After pains-taking efforts, he eventually concluded that the principle he stuck _______ true.
| A．to proved | B．to proving |
| C．to be proved | D．to being proved |
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