问题
选择题
It has been proved ___ eating vegetables in childhood helps to protect you against serious illnesses in later life.
A．if
B．because
C．when
D．that
答案
答案：D
主要测试主语从句。此题类同于(2007年 福建卷 35)的高考试题，具体祥解可以参考上文。句子译文：已经证明：年少时吃蔬菜有助于保护你在以后的生活中免收严重疾病的危害。