单项选择题

A. benefit performance is a performance for which a charitable organization has bought out at a discounted price and ______ funds by selling tickets at a full price.A. raises
B. accumulates
C. donates
D. contributes
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单项选择题
Suppose there were a flood or an earthquake and the people could not be reached by trains or trucks. ______ packages of food could be dropped from planes, the people might starve.
A. Until
B. Before
C. Unless
D. If only
单项选择题
______ for aches, pains and fever, aspirin is now the subject of multiple investigations of its role in treating many more serious complaints.
A. Long used
B. Being used long
C. Having been long used
D. It has long been used
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