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that; since since; 不填 when; that since; that
acquired accomplished achieved attained
did China change China has changed has China changed China had changed
introduce promote spread deepen
did China change China has changed has China changed China had changed
notice idea fact principle
came; has been teaching has been; has been teaching came; have been teaching has gone; have been teaching
when has Hongkong returned to China? how long Hongkong has been back in China? when had Hongkong been back in China? how long Hongkong had returned to China?
either in English or in Chinese not in Chinese but in English just in English，not in Chinese neither in Chinese nor in English
in praise of in memory of in honor of in celebration of
either in English or in Chinese not in Chinese but in English just in English, not in Chinese neither in Chinese nor in English
who has been to the USA in our class what was wrong with my computer when did China become a member of the World Trade Organization that China had successfully held the Olympic Games
studied; had visited; leaves had been studying; visited; is leaving has studied; visited; would leave was studying; has visited; leaves
come out put out gone out given out
will have has had has been will be
accomplished being accomplished to be accomplished having accomplished
has China made China has made does China make are made in China
A.did China perform China has performed was China performed China is performing
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