Years ago we didn’t know this , but recent science______that people who don’t sleep well soon get ill.
A．showedB．has shownC．will showD．is showing
D
考查時(shí)態(tài)。“幾年前，我不知道這件事，但最近的科學(xué)正在表明，睡眠不好的人容易得病�！庇眠M(jìn)行時(shí)
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