题目内容

A model or an experiment in a science class can help students see things which would ______ remain hidden.
A．otherwiseB．stillC．thusD．therefore
A
句意：在科学课上的一个模型或者一次试验可能会帮助学生看到否则就会隐藏起来的东西。otherwise“否则，要不然”，符合句意。
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