问题
选择题
His spare time is made full use ＿＿ law. 31-35 DACAB
A．to study
B． study
C．of studying
D．of to study
答案
答案：D
把原句被动句改成主动句：He makes full use of his spare time _______.再观察句子，句子主干完整，故后面应填不定式作目的状语。
点评：本题容易受思维定势的影响，选答案C，做题的关键是把被动句改为主动句，还原句子，这样容易看出句子结构。