单项选择题

（） in the classroom now is not allowed.

A、To sleep
B、Slept
C、Sleeping
D、Being slept

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单项选择题
They talked as if they （） good friends for years.

A、are
B、had been
C、were
D、have been
单项选择题
They failed in the match （） carelessness.

A、with
B、by
C、of
D、through
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