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用于肯定句時，賓語從句用whether引導；用于肯定句時，用that引導賓語從句。句意“我從不懷疑地球是圍繞太陽轉(zhuǎn)的�！备鶕�(jù)that可知，本句是否定句。故選B。
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