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_____ finish their task (任務(wù)), the students worked harder and harder.

A. So as to
B. As to
C. In order to
D. In order not to
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科目：高中英語 來源：廣西自治區(qū)期中題 題型：單選題

_____ finish their task (任務(wù)), the students worked harder and harder.
[     ]
A. So as to
B. As to
C. In order to
D. In order not to

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