改错What we should do now is not to increase production,but improving the quality of our productbut后面的improving应该改为improve还是to improve,还是两者均可,

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改错What we should do now is not to increase production,but improving the quality of our productbut后面的improving应该改为improve还是to improve,还是两者均可,
改错What we should do now is not to increase production,but improving the quality of our product
but后面的improving应该改为improve还是to improve,还是两者均可,

改错What we should do now is not to increase production,but improving the quality of our productbut后面的improving应该改为improve还是to improve,还是两者均可,
应该是but to improve
not..but..连接两个并列的结构,两个结构应该是相同的.前面是不定式,后面也应该是不定式.

两者皆可。
如果是improve的话，but连接的是increase production和improve the quality of our product两部分。
如果是to improve的话，but连接的是to increase production和to improve the quality of our product两部分。
but连接动词词组和不定式结构...

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to improve

improving。not……but… “不是……而是…”，not后是to do，那么but后也是to do

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