单项选择题

John felt a little disappointed and was about to leave, ______ something occurred which attracted his attention.

[A] while
[B] when
[C] until
[D] unless
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单项选择题
Many people believe that our species ______ threatened with extinction.
[A] is
[B] are
[C] are to be
[D] used to be
单项选择题
Her sharp ______ of the film in the paper this morning gave rise to a hot discussion.
[A] comment
[B] resume
[C] view
[D] review
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