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
B
考查動詞的時態(tài)。根據(jù)句子中的recent science可以知道句子中“含有過去發(fā)生的動作”對現(xiàn)在產(chǎn)生的影響。所以答案應(yīng)該用現(xiàn)在完成時。
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