单项选择题

Hello! Aviation Electronics Could I speak to Mr. Jones on ______ 8866, please

A．extension
B．branch
C．system
D．exchange
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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
单项选择题
______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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