单项选择题

A．They stay closed until summer comes.
B．They cater chiefly to tourists.
C．They are busy all the year round.
D．They provide quality service to their customers.
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问答题
After the war, The U.S. promised not to prosecute members in Unit 731 under the requirement that the Unit provided__________to U.S.
填空题
A．unlessB．onceC．whileD．as
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