问题描述：
the famous football player was going out ____he found a letter on the ground.
A.as B.when C.after D.until 为什么选B不选C
2.although sometimes he____catch a cold,that litter boy is generally healthy
A.does B.did C.do not Ddid not 为什么选A?
3.with only 15 minutes to ____before the plane took off ,i was still on the airport.
A.leave B.come C.take D.go为什么选D?
A.as B.when C.after D.until 为什么选B不选C
2.although sometimes he____catch a cold,that litter boy is generally healthy
A.does B.did C.do not Ddid not 为什么选A?
3.with only 15 minutes to ____before the plane took off ,i was still on the airport.
A.leave B.come C.take D.go为什么选D?
问题解答：
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