单项选择题

--I'm really thirsty. Do you think this water is safe ______ --Ask the farmer over there.

A．to drink
B．to be drunk
C．to drink it
D．to have it drunk
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单项选择题
The lecture seemed to have ______ only a short time, although the clock said it had gone on for more than an hour.
A．cost
B．lasted
C．spent
D．passed
单项选择题
I'm used to driving in Hong Kong now, but it ______ hard at the beginning.
A．is
B．was
C．had been
D．has been
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