问题
选择题
I have lost one of my gloves. I _____ it somewhere. [ ]
A. must drop
B. must have dropped
C. must be dropping
D. must have been dropped
答案
答案：B
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I have lost one of my gloves. I _____ it somewhere. [ ]
A. must drop
B. must have dropped
C. must be dropping
D. must have been dropped
答案：B