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I ________ that the earth moves around the sun.
A. often doubt                         B. never doubt                            C. sometimes doubt
B
考查doubt的用法。doubt用于肯定句时,宾语从句用whether引导;用于肯定句时,用that引导宾语从句。句意“我从不怀疑地球是围绕太阳转的。”根据that可知,本句是否定句。故选B。
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