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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 showC．was showingD．showed
A
本題考查時態(tài)。根據(jù)句意：我以前沒有意識到這一點，但最近的研究已經表明：吃太多的脂肪可能導致心臟病。recent research故用現(xiàn)在完成時態(tài)。
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