填空题

Hand in your papers when you ______ (finish) the test.

【参考答案】

have finished
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填空题
We went very often to Hyde Park where speakers ______ (address) the passing crowds on different subjects.
问答题
在十九世纪科学家发现人脑的某些部位受伤之后就失去了完成某些工作的能力。[说明] 动词found后全是它的从句。Certain：有些；—些：Certain plants will not grow in this country．有些植物在这个国家不能生长。People who smoke cannot travel in certain parts of the train. 吸烟的人不能在火车的某些地方走动。
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