单项选择题

As ______ announced in today's papers, the Shanghai Export Commodities Fair is also open on Sundays.

A．being
B．is
C．to be
D．been

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单项选择题

Because of the great speed of light, we see a lamp light up almost at the exact moment ______.

A．we turn it on
B．when we turn on it
C．that we turn on it
D．which we turn it on

单项选择题

The textile mill has over 8,000 workers, ______ are women.

A．eighty percent of those
B．eighty percent of which
C．eighty percent of whom
D．eighty percent of that

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