12. ________ a third yeat of the pandemic loomed, the seven-day average of U.S.
cases topped 267,000 on Tuesday.
(A) Through
(B) As
(C) Since
(D) In
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統計: A(4), B(5), C(2), D(1), E(0) #3024592
統計: A(4), B(5), C(2), D(1), E(0) #3024592