阿摩線上測驗
31. If we fail to ______ our claims, the supplier will not be aware of the problem.
(A) assert
(B) assertion
(C) asserting
(D) asserted
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統計： A(63), B(4), C(13), D(4), E(0) #3887968
統計： A(63), B(4), C(13), D(4), E(0) #3887968
