He is absent，as is often the case.
几组正误辨析：
1．误：We visited a factory where makes toys for children．
正：We visited a factory which that makes toys for children.
析：此句错误的原因是把先行词a factory当作从句中的状 语，实际上先行词a factory在从句中充当动词makes的主语。故关系词应使用which或that。
2．误：After living in Paris for 50years，he returned to the small town that he grew up as a child。
正：After living in Paris for 50years, he returned to the small town where he grew up as a child。
析：此句错误的原因是把先行词the small town当作从句中的宾语，实际上从句中缺少地点状语。因为从句中谓语动词grew up是一个不及物动词短语，其后的as a child已充当了宾语，故从句中缺少状语，应使用关系副词where。
3．误：He paid the boy $15 for washing ten windows，most of them hadn't been cleaned for at least a year．
正：He paid the boy $15 for washing ten windows, most of which hadn't been cleaned for at least a year．
误：This is the boy with him he worked．
正：This is the boy(that／whom) he worked with。
正：This is the boy with whom he worked．
析：在定语从句中，如果介词及介词短语用在从句前，其后必须用关系代词which(指物)、whom(指人)。上面两误句中先行词windows(物)，the boy(人)应分别使用most of which和with whom。如果介词及介词短语用在从句句尾，应按普通定语从句对待。
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unit1 Madame Curie教学目标