单项选择题

______, I didn't know how to use the machine.

A．At beginning
B．At first
C．At start
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单项选择题
The color of bananas is ______.
A．yellow
B．blue
C．red
单项选择题
Of all the three girls, I am much ______ than the others.
A．tallest
B．tall
C．taller
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