A model or an experiment in a science class can help students see things which would rema

问题补充：

A model or an experiment in a science class can help students see things which would remain hidden.

A. otherwise

B. still

C. thus

D. therefore

答案：

(答案→)A. otherwise

B. still

C. thus

D. therefore

解析：副词辨析。A否则，要不然；B仍然；C结果是；D因此；句意：科学课上的模型或者实验会帮助学生发现一些要不能仍然还藏着的东西。根据句意说明A正确。