单项选择题

______ of the companies uses online marketing to push their products through portal sites, blogs, and Web sites.

A．Most
B．Each
C．Every
D．All
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单项选择题
Most of the leading search engines are ______ in terms of the length of time in which they return results.
A．impressed
B．competitive
C．advisable
D．spacious
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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