单项选择题

The old professor had such a bad memory that he looked for the watch while he is ______ .

A．having it on
B．having on it
C．wearing it
D．putting it on
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The film had a very powerful effect ______ her.
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C．with
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Hearing the news, the boy burst into ______ .
A．laugh
B．laughing
C．laughter
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