单项选择题

Linton looked as though he（）ill for a long time.

A、 were
B、 was
C、 has been
D、 had been

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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
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
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