1. Rick could have said something for his neighbor on this matter, but he chose to keep _____.
(A) promise
(B) money
(C) silence
(D) habit
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統計: A(12), B(6), C(224), D(2), E(0) #3347627
統計: A(12), B(6), C(224), D(2), E(0) #3347627