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
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(答案→)A. has shown
B. will show
C. was showing
D. showed
解析:本题考查时态。根据句意:我以前没有意识到这一点,但最近的研究已经表明:吃太多的脂肪可能导致心脏病。recent research故用现在完成时态。