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：在科學(xué)課上的一個(gè)模型或者一次試驗(yàn)可能會(huì)幫助學(xué)生看到否則就會(huì)隱藏起來的東西。otherwise“否則，要不然”，符合句意。
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