单项选择题

We______ on it for many hours but we have not yet reached any concinsion.

A．work
B．have been worked
C．have been working
D．are working
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单项选择题
It was not ______ she took off her dark glasses ______ I realized she was a famous film star.
A．when, that
B．until, that
C．until, when
D．when, then
单项选择题
By the first sentence in Para.1, the writer probably means ______.
A．education has acquired a pleasant value
B．education is ignored by the public
C．too much attention is paid to degrees in the workplace
D．too little attention is paid to degrees in the workplace
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