单项选择题

A．keeping the peace
B．helping in the fight against cancer and AIDS
C．helping with elections in many countries
D．bringing relief to victims of disasters
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单项选择题
A．on Friday morningB．on Friday afternoonC．at dusk on FridayD．on Friday night
A．on Friday morning
B．on Friday afternoon
C．at dusk on Friday
D．on Friday night
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