/ wen aɪ mi:t'dɪfɪkəlt mæθs 'prɒbləmz aɪ tɜːn tə hɪm fə(r) help/
A、When I meet difficult maths problems,I turn to him for help.
B、When I meet difficult Chinese problems, I turn to him for help.
C、When I meet difficult maths problems, I turn to him for answers.
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