单项选择题

Indeed, with computers as basic as a Macintosh, producers can write scripts, budget productions, and ______ schedules and locations all on the same machine.

A．keep track of
B．keep up with
C．keep away from
D．keep abreast with
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单项选择题
Addition of any chemical compound to the environment in quantities ______ a significant fraction of the total content of gasoline may have unexpected environmental consequences.
A．that constitute
B．which constitutes
C．that are substituted by
D．which substitute
单项选择题
______, the distinction between creators and users of corporate television is blurring.
A．Whatever the case is
B．Whichever case be
C．Whatever the case
D．What the case is
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