阿摩線上測驗
18、Mobile homes have been gaining favor as _____ to increasingly expensive conventional housing.
(A) an addition
(B) an alternative
(C) an introduction
(D) a reaction
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統計： A(19), B(63), C(3), D(9), E(0) #2963962
統計： A(19), B(63), C(3), D(9), E(0) #2963962
