语法与词汇 A hypothesis must not only account for what we already know, but it must also be ______ by continued observation.

【正确答案】 C

【答案解析】句意：一个假设不仅要解释我们已经知道的东西，还必须通过持续的观察来验证。 verify核实。 refute反驳。 discredit使名誉扫地。