单项选择题

The retired president was very angry ______ even by the cooks.

A．to be ignored
B．to have been ignored
C．to having been ignored
D．to have ignored
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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
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
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