According to structure, which kind of sentence does the following sentence belong to?I looked for Ma

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According to structure, which kind of sentence does the following sentence belong to?I looked for Mary and Samantha at the bus station, but I did not see them, because they had left before I arrived at the station.

A.Simple

B.Compound

C.Complex

D.Compound-complex

参考答案:

答案:Compound-complex