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英语题Choose the correct word

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英语题Choose the correct word
b. Boeing 747’s (is – are – were) manufactured in Seattle.
c.Flights to Peking (was – are – were introduced in 1980
. are 句子意思是,波音747飞机是在西雅图生产.Boeing 747s已经是复数所以用复数形式
c. were 句子意思是:在1980就有航班被介绍飞往北京.1980是一个过去时间,所以时态应该选用一般过去时,从flights确定谓语动词应该用复数.