问题: 改错
1.Before being typed,you must read the letter carefully.
2.After having mended,the machine worked again.
3.Having asked if the operation had been successful,the doctor said that it had.
4.After examining the old patient,another patient came to see the doctor.
解答:
你的错太多了，不好改, 改改看吧．
1.Before typing ,you must read the letter carefully.
2.After having been mended,the machine worked again.
3.Having been asked if the operation had been successful,the doctor said that it had.
4.After the doctor had examined the old patient,another patient came to see the doctor.
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