Please call me if you have any problems ______ (work) out.答案是working但to work 两者有何区别?

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Pleasecallmeifyouhaveanyproblems______(work)out.答案是working但towork两者有何区别?Pleasecallmeifyouhaveanyprob

Please call me if you have any problems ______ (work) out.答案是working但to work 两者有何区别?
Please call me if you have any problems ______ (work) out.
答案是working
但to work
两者有何区别?

Please call me if you have any problems ______ (work) out.答案是working但to work 两者有何区别?
不知道,只知道有个短语
have trouble/difficuit/a problem/problems doing