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  3. This new type of car is fitted with an effective engine, which is______fuel.

This new type of car is fitted with an effective engine, which is______fuel.

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问题 This new type of car is fitted with an effective engine, which is______fuel.
选项 A、economic of
B、economized of
C、economical of
D、economist of
答案C
解析 词汇题。短语be economical of意为“节省的”，其他选项中的economic意为“经济(学)的”；economize意为“节省”；economist意为“经济学家”。题干意为：这种新型汽车配备有高效发动机，可以节省燃油。
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