問題詳情

20. The new janitor, _____ the remodeled security system, triggered the alarm by accident.【請在下列各題中選出最適當的答案】
(A) never understand
(B) not been understood
(C) not to know
(D) not understanding

參考答案

答案:D
難度:適中0.518519
統計:A(5),B(2),C(2),D(14),E(0)

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