单项选择题

A) Eight hours. C) Three hours and a half.
B) Two hours and a half. D) Four hours.
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单项选择题
A) By a central control system. C) By several separated computers. B) By a mechanical ann. D) By a few people.
A) By a central control system. C) By several separated computers.
B) By a mechanical ann. D) By a few people.
填空题
Mary (study) ______ English on the radio every morning.
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