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Cache onl yserver Forwarder server Proxy server Slave server
captured were captured have captured have been captured
will wait;arrives have waited; will arrive have been waiting; arrives waited;arrives
It；be It；have There; have There; be
Almost all of Most all of Most of all Almost the whole of
Several thousands Thousands of the Thousands of Twenty thousand of
Thousand, for Thousand, to Thousands, to Thousands, for
are waiting have waited have been waiting will wait
twenty thousand twenty thousands thousands of the several thousands
wouldn’t have come would come should have come shouldn’t come
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