【题目】________ the students from their endless homework the school has decided to take a series of measures.
A. FreedB. To free
C. FreeingD. Having freed
在线课程【答案】B
【解析】
考查非谓语动词。句意：为了把学生从没完没了的作业中解放出来，学校决定采取一系列措施。本句已经存在谓语动词且句中没有连词，故free只能做非谓语动词，在本句中做目的状语故用不定式，选B。