2016年大學六級作文常用句型:表示緊急有困難

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表示必須,緊急,有困難做某事的句型:   1) It is important (necessary, urgent, difficult, easy, convenient, comfortable, expensive, desirable, advisable) for sb. to do sth.   2) ...have trouble/difficulty/a hard time/a difficult time (in) doing sth. (有困難做某事)