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

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

admin2011-02-26  43
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
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