Part B.       Over the last two weeks, more than a thousand protests—most of them peaceful, though somedevolved into violence—    9.    across America    10.    by outrage over the death of George Floyd,recorded as a Minneapolis police officer    11.    a knee to his neck    12.    nearly nine minutes whileFloyd was handcuffed and lying face down. Floyd was one of approximately 1,000 Americans    13.    annually, a disproportionate number    14.    like him, are African American.        15.    their eyes to the past, observers search for comparisons to today’s uprisings in the chaos of1968. But the roots of 2020’s events go far deeper into the last hundred years of American history, whichwere punctuated by race    16.   , massacres, and clashes between the police and African Americans.Starting in 1919, three major waves of nationwide uprisings in the 20th century shed light on how the fightfor racial equality has grown, how it’s changed, and    17.    has stayed the same.
【題組】9.
(A) sweep
(B) have swept
(C) swept
(D) had swept