(单选题) Years ago we didn’t know this, but recent science ______ that people who don’t sleep well soon get ill.(本题2.0分) A、 showed B、 has shown C、 will show D、 is showing

(单选题) Years ago we didn’t know this, but recent science ______ that people who don’t sleep well soon get ill.(本题2.0分)
A、 showed
B、 has shown
C、 will show
D、 is showing

出自：西南石油大学-机电一体化技术-大学英语

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