2. 外语
  3. Solar Acells, which are often Bcall photovoltaic cells, are Ccomposed of single crystals of Dsilicon.

Solar Acells, which are often Bcall photovoltaic cells, are Ccomposed of single crystals of Dsilicon.

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问题 Solar Acells, which are often Bcall photovoltaic cells, are Ccomposed of single crystals of Dsilicon.
选项 A、 
B、 
C、 
D、 
答案B
解析 Call is incorrect after are often because it is not the passive form. Correction: called.
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