Some students have trouble ______grammar while others have difficulty______ new words.A.in; rememberB.for; to rememberC.on; rememberingD.with; remembering
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D解析考查trouble固定结构。Have some trouble with sth;have some trouble in doing sth做某事有困难。句意:一些学生在语法方面有困难,而其它学生在记忆新单词方面有困难。故D正确。