单项选择题

Employees on day shifts may use the computer lab at any time, but ______ who work at night should obtain a manager"s permission.

A．somebody
B．these
C．them
D．those
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单项选择题
It is advisable to look for a professional consulting service when executives are ______ about future market trends.
A．unknown
B．unavailable
C．unable
D．unsure
单项选择题
The charity has collected more than 10 million dollars this year, which is far ______ its early expectations.
A．beyond
B．back
C．over
D．under
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