问题
选择题
----Martin Murray used to be afraid of ______ alone.
----But now he realizes that his mother is always there for him.
A．is
B．was
C．be
D．being
答案
D
题目分析: 句意：马丁.穆雷过去常常害怕孤独。但现在他意识到他的妈妈一直在那儿陪他。used to过去常常做某事，be afraid of 害怕，后接动名词，故选D