Question

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

A．thinking of

B．to think of

C．thought of

D．think of .

Answer 1

A

解题关键：have trouble in doing sth，此处in可以省略。句意：当Peter当众讲话的时候，他总是很难想起该说的话。
【考点定位】考查非谓语动词的用法。