No one knows ______effects the GM material might have on the food chain.
A．whatB．whichC．whoseD．how
A

試題分析：考查賓語從句，what在賓語從句中可做主賓表和定語，這里what修飾effects，句意是：每人知道GM材料會對食物鏈有什么樣的影響。選A。
點評：如果賓語從句缺少主賓表和定語要考慮用what，做題是關(guān)鍵時分析句子成分。
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