Tod was working at his gas station he heard over the radio that a bank in Long I
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Tod was working at his gas station ________ he heard over the radio that a bank in Long Island had been broken into by an armed man who killed the night guard and got away with $150,000.
A.while
B.when
C.then
D.at that time
试题答案
B
when作并列连词,意思是“突然,正在这时”。