You don’t have to install this radio in your new car. It’s an______extra.

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问题 You don’t have to install this radio in your new car. It’s an______extra.

选项 A、excessive
B、optional
C、additional
D、arbitrary

答案B

解析 A项excessive意为“过多的；过分的”；B项optional意为“选择的；非强制的”；C项additional意为“额外的；附加的”；D项arbitrary意为“霸道的；武断的”。

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