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

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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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