单项选择题

Because of the complexity of the modern machine, most offices require secretaries ________.

A．to have specified training
B．specified in traing
C．to train specifiedly
D．training specified
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单项选择题
Because of the bad food he had eaten, his stomach began to ________.
A．pain
B．be hurt
C．ache
D．harm
单项选择题
The disappearance of her paper has never been ________.
A．counted for
B．looked up
C．accounted for
D．checked up
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