A model or an experiment in a science class can help us see things which wouldremain hidde

问题补充：

A model or an experiment in a science class can help us see things which wouldremain hidden．

A. therefore

B. yet

C. otherwise

D. still

答案：

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。