【題目】With doubts _______ through my mind, I felt it necessary to carry out a research.

A．to run B．run

C．running D．having run

【答案】C

【解析】本題考查非謂語。 句中doubts與 run是主動關(guān)系，不強(qiáng)調(diào)時間先后，因此選擇C

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