Mr.Wang does what he can to do us improve our English.为什么can后面要加to do

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• Mr.Wang does what he can to do us improve our English.为什么can后面要加to do
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• Mr.Wang does what he can to do us improve our English.为什么can后面要加to do
• Mr.Wang does what he can to help us improve our English.请帮忙分析一下这个定语从句为何无谓语?
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• Mr.Wang does what he can to help us improve our English.请帮忙分析一下这个定语从句为何无谓语?
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