单项选择题

The child took a spoonful and tasted it carefully __________ it was hot.

A．in case
B．provided
C．if
D．unless
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单项选择题
Mr. Tyler asked his son to pay more __________ to his study.
A．notice
B．attraction
C．concern
D．attention
单项选择题
In arithmetic the rules of addition are basic, and all the other rules are built on this __________.
A．basis
B．bases
C．base
D．basises
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