I have lost one of my gloves. I _____ it somewhere.
A．must dropB．must have dropped
C．must be droppingD．must have been dropped
B
由題干而知不用被動，排除選項D；題干說“已經(jīng)丟了”，排除選項C；選項A“情態(tài)動詞+動詞原形”，表示對現(xiàn)在或?qū)淼氖虑橥茰y；選項B“情態(tài)動詞+動詞的完成時”表示的是對過去或已經(jīng)發(fā)生的事情的推測判斷，所以選B。 
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