2018年6月英语六级作文常用句型：表示必须紧急

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　　英语六级作文常用句型：表示必须,紧急,有困难做某事的句型
        　　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.
(有困难做某事)