单项选择题

The bird flew upward and dropped the shellfish onto the rock to ______it open.

A．break
B．press
C．cut
D．shake
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单项选择题
People appreciate ______with him because he has a good sense of humor.
A．to work
B．to have worked
C．working
D．having worked
单项选择题
The hours _____the children spend in their one-way relationship with television people undoubtedly affect their relationships with real-life people.
A．in which
B．on which
C．when
D．that
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