A model or an experiment in a science class can help us see things which would remain hidden．
A. therefore
B. yet
C. otherwise
D. still
网友回答
A. therefore
B. yet
(答案→)C. otherwise
D. still
解析：考查副词辨析。A因此；B可是；C否则，要不然；D仍然；句意：科学课上的实验可以帮助我们看到要不然仍然隐藏的事情。故C正确。