It has been proved _____ eating vegetabl
题型：选择题
问题：
It has been proved _____ eating vegetables in childhood helps to protect you against serious illnesses in
latter life. [ ]
A. if
B. because
C. when
D. that
It has been proved _____ eating vegetables in childhood helps to protect you against serious illnesses in
latter life. [ ]
A. if
B. because
C. when
D. that