The soil ________ the dead leaves above.
A.is made ofB.made fromC.is made inD.is made by在线课程B
解析:
句意:“土壤是由上面的落叶腐烂而成的。”be made from“由……制成”,从成品表面看不出原料,be made of“用……制成”,从成品表面能看出原料,be made in “由某地生产或制造”“产于某地”,in后接表示地点的名词,be made by“被……制造”是被动语态,by后接动作的发出者,根据题意,应选项B项。
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