23. Failure as he has been in his previous attempts, he still sticks _________ the research aimed _______ increasing production.
| A．in; to | B．out; at | C．on; in | D．with; at |
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23. Failure as he has been in his previous attempts, he still sticks _________ the research aimed _______ increasing production.
| A．in; to | B．out; at | C．on; in | D．with; at |
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