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

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

出自：石家庄铁道大学大学英语1

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