阿摩線上測驗
20. ______ during the economic downturn, many middle-class families received their crash course to learn the value of thrift.
(A) To force to be frugal
(B) To force being frugal
(C) Forcing to be frugal
(D) Forced to be frugal
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統計： A(3), B(6), C(11), D(17), E(0) #2741910
統計： A(3), B(6), C(11), D(17), E(0) #2741910
