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
Your grandmother____________ to the hospital at once．
A．must send
B．must be sent
C．must to be send
单项选择题
Mr. Brown has too many meetings to ________.
A．attend
B．take
C．join
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