单选题
They were at work when they received _______SOS from _______school, and they immediately stared their police cars.
A、
the, the
B、
a, a
C、
an, a
D、
the, a
【正确答案】
C
【答案解析】
[参考译文] 当他们在工作时接到了来自一所学校的求助，于是他们赶紧发动了警车。两空均为泛指，“S”元音开头，前应用an。
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