单项选择题

A．be taking place
B．take place
C．be taken place
D．have taken place
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单项选择题
A．medical careB．foodC．cosmeticsD．services
A．medical care
B．food
C．cosmetics
D．services
单项选择题
A．whenB．whileC．sinceD．then
A．when
B．while
C．since
D．then
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