finish their task ahead of time, the students worked harder and harder. A. So as toB. As

finish their task ahead of time, the students worked harder and harder.
A. So as to
B. As to
C. In order to
D. In order that

A. So as toB. As to(答案→)C. In order toD. In order that解析：考查目的状语：句意：为了提前完成他们的任务，学生们越来越努力了。so as to不用于句首。而in order to“为了……”，可以放在句首，in order that后面接从句，as to至于，选C。

这个答案应该是对的