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
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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
单项选择题
Psychologists clearly have their own marketplace and, ______, have a hold on the major portion of the outpatient services rendered to the public.
A．as stated earlier
B．stating earlier
C．as is stated
D．as was stated
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