习惯用法: have /has/had+ 名词（trouble, difficulty,fun等）+in （可以省略）+ doing sth
比如，
①. I have trouble in solving this problem. 我解不出这道题。（解决这问题我有麻烦。）
②. She has fun singing and dancing. 她又唱又跳很开心。
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习惯用法: have /has/had+ 名词（trouble, difficulty,fun等）+in （可以省略）+ doing sth
比如，
①. I have trouble in solving this problem. 我解不出这道题。（解决这问题我有麻烦。）
②. She has fun singing and dancing. 她又唱又跳很开心。
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