问题
选择题
47. Three hundred firemen raced to the hotel after a smoke detector ______ the alarm soon after midnight.
A．set off
B．set out
C．gave away
D．gave off
答案
A
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47. Three hundred firemen raced to the hotel after a smoke detector ______ the alarm soon after midnight.
A．set off
B．set out
C．gave away
D．gave off
A