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the famous football player was going out ____he found a lett

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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?
1 著名球星正在往外走,就在那时(这里只有when能表达出 这个意思)他发现地上有一封信.
2 尽管这孩子有时候确实也得个感冒什么的,但他总体还是健康的.这里用does 表示强调动词catch a cold,就像我英语中表达 “他确实这样说过 He did say that ".
3 有句常说的话,是 we have 5 minutes to go 我们还有五分钟(可用),可以说是习惯用法.
希望以上解释能够有助于这位网友解开疑问.
再问: do起强调作用是否与句子时态一致??
再答: 是的