(2018·全国卷Ⅰ)Ijumpedattheideaoftakingtheclass

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(2018·全国卷Ⅰ)I jumped at the idea of taking the class ________， after all, who doesn't want to save a few dollars?

because　句意：我迫不及待地想去上这门选修课，因为毕竟谁不想省几个钱呢？此处表示原因，故使用because引导原因状语从句。