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(shí)，賓語(yǔ)從句用whether引導(dǎo)；用于肯定句時(shí)，用that引導(dǎo)賓語(yǔ)從句。句意“我從不懷疑地球是圍繞太陽(yáng)轉(zhuǎn)的。”根據(jù)that可知，本句是否定句。故選B。
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