科研之友
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<正>【重点词组或短语】1. used to do过去常常2. be used to doing...习惯做3. be used to do被用来作4. pay attention to (doing) sth.对……注意5. give up doing=stop doing放弃做……6. instead of (doing)...代替;而不是7. lose interest in对……失去兴趣8. be afraid of doing sth.惧怕做某事9. be afraid that惧怕
