单项选择题

There is a hole at the ______ of the pot.

A．base
B．bottom
C．ground
D．basis
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单项选择题
The new regulation does not go into ______ until the first of July.
A．effort
B．effect
C．affect
D．influence
单项选择题
Your advice would be ______ valuable to him, who is at present at his wit's end.
A．exceedingly
B．extremely
C．extensively
D．exclusively
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