题目：
_____ time, the teacher had us do half of the exercises in class and complete the other half for our homework.
A．To save
B．Save
C．Saving
D．Having saved
答案：
A
题目分析：考查非谓语动词。句意：为了节省时间，老师要求我们在课上做一半的练习然后剩下的留成作业。根据 the teacher had us do half of the exercises in class and complete the other half for our homework可知这样做的目的是节约时间，故选A项。
考点 : 考查非谓语动词
