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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单项选择题
The king's daughter threatened to drink the ______ chemical if he refused her request.
A．deathly
B．deadly
C．fatal
D．mortal
单项选择题
The teachers whispered ______ they should disturb the students.
A．in order that
B．provided that
C．in case
D．with the result that
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