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she asked( ) A.how much he cost the computer B.how much the

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she asked( ) A.how much he cost the computer B.how much the computer cos.
She asked( ).
A.how much he cost the computer
B.how much the computer cost
C.howmuch did he pay for the computer
D.how much did he spend on the computer
那C和D为什么不可以呢?
选择B
因为从句要用陈述语序,所以CD排除.A中cost的主语是物,不是人.cost + sb.sth./money