Mysister,aninexperiencedrider,wasfoundsittingonthebicyc...

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My sister, an inexperienced rider, was found sitting on the bicycle______to balance it.

A. having tried B. trying C. to try D. tried

解析此题考查非谓语动词的用法。句中的空格处动词与主语my sister构成主动关系，即try这个动作是my sister发出的，所以用trying表示她主动“设法/尝试着保持自行车平衡”。