单项选择题

(Nearly) half of Americans (aged) 25 and (old) take part in some (form) of continuing education.

A．Nearly
B．aged
C．old
D．form
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单项选择题
(How and why) this language (has) survived for more than a thousand years, while (spoke) by very few, is hard (to explain).
A．How and why
B．has
C．spoke
D．to explain
单项选择题
Over (the past) 20 years, the Internet has (helped change) our world in (either) way or another (for the better).
A．the past
B．as well as
C．to dinner
D．neither of
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