单项选择题

--How long have you been ill

A．Since last week
B．A week ago
C．Once a week
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单项选择题
The hospital _______last year.
A．built
B．was built
C．has been built
单项选择题
We don’t understand the passage ___ there are a few .new words in it.
A．and
B．unless
C．because
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