单项选择题

The hostess went to great ______ to make the child comfortable and feel at home.

A．efforts
B．lengths
C．heights
D．details
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单项选择题
Everybody seemed to have known about his scandal, only his wife was kept in the ______.
A．dark
B．ignorance
C．shade
D．shadow
单项选择题
We should recognize that every company and every person is part of a long ______ of customers and suppliers.
A．pool
B．line
C．stream
D．chain
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