【題目】The river is about six thousand six________and seventy kilometers long．

A．hundred

B．a(chǎn) hundred

C．hundreds

D．hundreds of

【答案】A

【解析】句意為“這條河長約6670千米”。前面有具體數(shù)字修飾時，hundred，thousand等要用單數(shù)形式。

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