单项选择题

I felt somewhat disappointed and was about to leave, ______ something occurred which attracted my attention.

A. unless
B. until
C. when
D. while
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单项选择题
A human's eyesight is not as ______ as that of an eagle.
A. eccentric
B. acute
C. sensible
D. sensitive
单项选择题
His visit to the theater was ______ because a lady sitting right in front of him was wearing a huge hat which blocked his view of the stage.
A. impaired
B. spoiled
C. distracted
D. offended
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