阿摩線上測驗
13. The manufacturer used biodegradable materials as an ______ for plastic.
(A) alternative
(B) excursion
(C) ultimatum
(D) ignition
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統計： A(543), B(49), C(63), D(27), E(0) #2378918
統計： A(543), B(49), C(63), D(27), E(0) #2378918
