____ many difficulties, they still went on with their experiment

____ many difficulties, they still went on with their experiment.
A、Face
B、Faced
C、Facing with
D、Faced with
【正确答案】：C
【题目解析】：分析句式：整个句子有两部分组成,根据逗号分为前半部和后半部,后半部有主谓宾,所以是一个完整的句子,所以前部分为短语,分析动词与主语（they）的关系,是主动关系,所以选C.句意：面对种种困难,他们依旧继续他们的实验.