My wallet is nowhere to be found.I_____it when I was on the bus.　 (A) must drop (B) should have dropped (C) had dropped (D) must have dropped

My wallet is nowhere to be found.I_____it when I was on the bus.　
(A) must drop
(B) should have dropped
(C) had dropped
(D) must have dropped

出自：郑州工程技术学院-建筑CAD

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