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试题详情及答案解析
When Peter speaks in public, he always has trouble       the right things to say.
A.thinking ofB.to think of
C.thought ofD.think of
答案:A
试题分析:考查动词的使用。have trouble doing sth 做某事有困难。句意:当Peter在公众场合说话的时候,他总是很难想到合适的说话的内容。故选A。
考点:考查动词的使用