单项选择题

（）, such damages are usually due to carelessness in operation.

A．At large
B．By far
C．In common
D．In general

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单项选择题
-- Shall I tell John about it -- No, you. I've told him already.（）

A．needn't
B．wouldn't
C．mustn't
D．shouldn't
单项选择题
（）, the knowledge economy has become the major characteristic of the national economy of most developed countries.

A．Once in a while
B．For the time being
C．From time to time
D．Once upon a time
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