单项选择题

Can you tell me ________ there is plenty of rain in spring

A．how
B．why
C．when
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单项选择题
_________ Saturdsy morning，Mary arrived _________ Beijing.A. On．．．in B．In．．．at C．On．．．at
_________ Saturdsy morning，Mary arrived _________ Beijing.
A. On．．．in B．In．．．at C．On．．．at
单项选择题
Your grandmother____________ to the hospital at once．
A．must send
B．must be sent
C．must to be send
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