A model or an experiment in a science class can help us see things which would_______ remain hidden.
A．thereforeB．yetC．otherwiseD．still
C

試題分析：副詞辨析。A因此；B可是；C否則，要不然；D仍然；句意：科學課上的實驗可以幫助我們看到要不然仍然隱藏的事情。故C正確。
點評：副詞的詞義辨析要放在上下文中進行，要根據(jù)語境來辨析。本題的otherwise考查較多。
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