130. We apologize for the delay in processing your order, which was caused by an error in our inventory_______ system.
(A) track
(B) tracks
(C) tracked
(D) tracking  

答案：登入後查看
統計： A(14), B(6), C(12), D(88), E(0) #3810352

詳解 (共 1 筆)

#7287513
名詞 + 動名詞 + system能直接...
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