The station was full of thieves. He warned me to keep an eye on my luggage.
A.He warned me to keep an eye on my luggage as the station was full of thieves.
B.When the station was full of thieves, he warned me to keep an eye on my luggage.
C.Only when the station was full of thieves, did he warn me to keep an eye on my luggage.
D.The reason why he warned me to keep an eye on my luggage was because the station was full of thieves.

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