finish their task ahead of time, the students worked harder and harder.
A. In order to
B. So as to
C. As to
DIn order not to
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(答案→)A. In order to
B. So as to
C. As to
D. In order not to
解析：词义辨析题。In order to“为了”用在句首或句中；So as to“为了”不能位于句首。 句意：为了提前完成任务学生们越来越努力。