Do you know (how much she paid for) the MP3 player last week?Do you know ----------the MP3 player last week?为啥要填how much she paid
问题描述：
Do you know (how much she paid for) the MP3 player last week?
Do you know ----------the MP3 player last week?为啥要填how much she paid
答
这里是宾语从句，宾语从句中要用陈述句句式。 因为上周买过了，所以时态用过去时。
答
Do you know
How much did she pay for the MP3 player last week?
合并句子可得
答
因为这是 宾语从句,在宾语从句中,特殊疑问句要用陈述句语序
how much did she pay for叫疑问句语序