单项选择题

A lot of experiment work is being done to increase own knowledge about insomnia and other sheep - related problems in order to help people who are（）of sheep.

A．dominated
B．derived
C．distressed
D．bereaved

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单项选择题
You should do（）investigations on this matter.

A．farther
B．much father
C．more father
D．further
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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