【题目】All through the morning, Mary did nothing but______ on the sofa, watching TV.
A. to sit B. sitting
C. sit D. sat
在线课程【答案】C
【解析】考查固定结构。but表示“除了”讲时，如果前面含有行为动词do的某种形式时，则后面用不带to的动词不定式；否则but后面用带to的动词不定式。此句but前面有行为动词did，故选C。
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