单项选择题

He was so absorbed ______ his work that he didn't notice me entering his mom.

A．at
B．on
C．for
D．in
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单项选择题
The number of cell phones ______ increased dramatically in the past few years.
A．have
B．are
C．has
D．is
单项选择题
The sports meeting ______ next Saturday.
A．is to hold
B．is holding
C．holds
D．is to be held
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