单项选择题

John's success in his career will be a great（）to his aged parents.

A．satisfaction
B．concentration
C．attraction
D．solution

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The father was delighted to hear the child（）that.

A．to say
B．to have said
C．say
D．said
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On April 1st they flew to Beijing, （）they stayed several days.

A．when
B．where
C．which
D．there
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