单项选择题

My wallet is nowhere to be found. I ______ when I was on the bus.

A．must have dropped it
B．must drop it
C．should have dropped it
D．ought to have dropped it
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单项选择题
My new glasses cost me ______ the last pair that I bought.
A．three times
B．three times as much as
C．three times as much
D．three times much as
单项选择题
A．possibleB．advisableC．acceptableD．desirable
A．possible
B．advisable
C．acceptable
D．desirable
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