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How and why this language has survived for more than a thousand years，while spoke by very few，is hard to explain.　　A B C D
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A．stay B．be staying C．stayed D．staying
A．stay
B．be staying
C．stayed
D．staying
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.Over the past 20 years，the Internet bas helped change our world in either Way or another for the better. A B C D
.Over the past 20 years，the Internet bas helped change our world in either Way or another for the better.　　A B C D
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