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
______ a certain doubt among the students as to the necessity of the work.
A．There existed
B．They had
C．There had
D．It existed
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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