单项选择题

_________ Saturdsy morning，Mary arrived _________ Beijing.A. On．．．in B．In．．．at C．On．．．at
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单项选择题
Mr. Brown has too many meetings to ________.
A． attend
B． take
C． join
单项选择题
He ________ but ________ nothing.
A． heard.., listened
B． listened.., heard
C． listened to... heard
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