问题
选择题
When Peter speaks in public, he always has difficulty ______ the right things to say.
A．thinking of
B．to think of
C．thought of
D．think of
答案
A
题目分析：考查固定词组。固定词组have some difficulty (in) doing sth做某事有困难。句意：当Peter当众发言的时候，他总是很难想起要说的事情。故A正确。
点评：固定词组have some difficulty (in) doing sth做某事有困难，注意其结构的变化。