单项选择题

A．Such strikes are against the British law.
B．Such strikes are unpredictable.
C．Such strikes involve workers from different trades.
D．Such strikes occur frequently these days.
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单项选择题
A．The change of the nature of occupations.B．The decrease of social wealth.C．The change of educational degree.D．The increase of job opportunities.
A．The change of the nature of occupations.
B．The decrease of social wealth.
C．The change of educational degree.
D．The increase of job opportunities.
填空题
Nowadays a demand for this specialized type of service has been created because ______.
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