整数集对于加法的运算构不构成一个群()
A. 构成
B. 不构成
If you think you are fit for this job, you can__________(在月底之前提交简历).
靡靡之音，祸国殃民，所以文明要听古典音乐而不是流行音乐。()
200 years ago, grown children from rich families were supposed to ______ in foreign countries, which became a fashion.
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