单项选择题

--Please don't tell anybody.
--I (), I promise.

A．won't
B．don't
C．can't
D．mustn't

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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
The firemen arrived half an hour () the alarm was first raised, when it was too late to save much of the building.

A．since
B．after
C．as
D．until
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