单项选择题

Indigo is a vat color,______ called because it does not dissolve in water.

A．which it
B．it is
C．but
D．so
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______so many profits have been made in the past three years is the strongest argument for continuing the business.
A．What
B．Since
C．That
D．As
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The doctor recommends me ______ on a strict diet.
A．to go
B．going
C．I should go
D．go
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