Theywereatworkwhentheyreceived_______SOSfrom_______school,andtheyimmediatelystaredtheirp

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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

参考答案:

C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。