问题
选择题
I wasn't aware of this before, but recent research _____ that eating too much fat can contribute to heart disease. [ ]
A. has shown
B. will show
C. was showing
D. showed
答案
答案：A
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I wasn't aware of this before, but recent research _____ that eating too much fat can contribute to heart disease. [ ]
A. has shown
B. will show
C. was showing
D. showed
答案：A