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

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you got Ul5 late won't be a sufficient excuse for your being late for class（）

A、 It is
B、 That
C、 Because
D、 What
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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