单项选择题

Most children do not become permanently right- or left-handed ______ they are five or six years old.

A．since
B．until
C．as long as
D．once
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单项选择题
Surely you remember ______ him the money I hope that he won't forget to pay you back.
A．lend
B．to lend
C．lending
D．to have lent
单项选择题
It's no use blaming him. He had no choice but ______ as he was told.
A．do
B．to do
C．did
D．had done
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