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一道初一英语填空题What did the Blacks do before _ to the airport?

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一道初一英语填空题What did the Blacks do before _ to the airport?
What did the Blacks do before _ to the airport?A.they start B.starting C.started D they starting 为什么选B
efore是介词,后面的动词用ing形式.
before也可以做连词,后面接句子.句子要有主语.例如
What did the Blacks do before they started to the airport?
原题中before后面没有主语,所以后面接的不是句子.