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Our professor told us that salt water _____ at a lower temperature than fresh water.
A.is freezingB.was frozenC.freezesD.froze
C
考查时态,句意:我们的教授告诉我们盐水和淡水相比在非常低的温度下会结冰。根据语境,这是一种自然现象,所以应用一般现在时态。选C。
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