2. These used plastic boxes cannot be thrown out as garbage. You must ______ them.
(A) hurry
(B) decide
(C) recycle
(D) protect
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統計: A(25), B(46), C(1892), D(29), E(0) #2385217
統計: A(25), B(46), C(1892), D(29), E(0) #2385217