单项选择题

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
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单项选择题
I can't stand ______ as a little girl.
A．to treat
B．to have treated
C．treating
D．being treated
单项选择题
I beg ______ tomorrow's meeting.
A．to be excused to
B．to excused from
C．to be excused from
D．to excuse from
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