---Laura, we've decided ________ on a trip this afternoon. Will you join us?---I'm afraid not. I have a position ________.A.to go; to writeB.to go; writingC.going; to writeD.going; writing
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A解析decide后面接动词时要用动词不定式，由此排除C、D；结合“I'm afraid not（恐怕我今天下午我不能旅行）”可知“我有一篇作文要写”，故应用动词不定式作定语修饰position。因此选A。