阿摩線上測驗
80. Ozone, a dangerous pollutant in smog, can cause damage to________ it touches.
(A)which
(B)whatever
(C)that
(D)them
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統計： A(94), B(427), C(28), D(10), E(0) #1616911
統計： A(94), B(427), C(28), D(10), E(0) #1616911
