问题
选择题
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
答案
答案：A
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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
答案：A