My watch is nowhere to be found. I _____ when I was on the bus. A must drop it B should have dropped it C must have dropped it D ought to have dropped it

My watch is nowhere to be found. I _____ when I was on the bus.
A
must drop it
B
should have dropped it
C
must have dropped it
D
ought to have dropped it

出自：河南商丘师范学院幼儿英语(专升本)

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