The survey showed that ______ numbers of 15-year-olds were already smoking twent

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问题 The survey showed that ______ numbers of 15-year-olds were already smoking twenty cigarettes a week.

选项 A、essential
B、steady
C、primary
D、substantial

答案 D

解析 essential本质的；steady稳定的；Primary主要的，初步的；substantial大体上，基本上，实质的，坚固的。

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