15.
(A) I think recycling is hard.
(B) I think recycling is extra.
(C) I think recycling is important.
(D) I think recycling is pleasant.
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統計: A(7), B(16), C(268), D(10), E(0) #3293298
統計: A(7), B(16), C(268), D(10), E(0) #3293298