阿摩線上測驗
The United States and Europe are demanding that India and other exporting countries ___ barriers of their own.
(A) lower
(B) lowered
(C) lowering
(D) to lower
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統計： A(574), B(178), C(201), D(231), E(0) #312775
統計： A(574), B(178), C(201), D(231), E(0) #312775
