Peter has a high level of English,but he still has some trouble ___ his pronunciation填介词

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Peter has a high level of English,but he still has some trouble ___ his pronunciation填介词
Peter has a high level of English,but he still has some trouble ___ his pronunciation填介词

Peter has a high level of English,but he still has some trouble ___ his pronunciation填介词
in

have trouble in sth/ in doing sth

in