【題目】When Peter speaks in public, he always has trouble _ the right things to say.

A.thinking ofB.to think ofC.thought ofD.think of

【答案】A

【解析】

考查非謂語動詞。句意：當Peter在公眾場合說話的時候，他總是很難想到合適的說話的內(nèi)容。have trouble（in） doing sth 做某事有困難。故選A項。

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