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．that
C．what
D．when
答案
答案：B
考查名词性从句，that只起连接作用不做成分没意义。 据证实幼时吃蔬菜有助于今后的重大疾病的防御。
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