—What are you going to do this afternoon？—I'm thinking of _____ to visit my aunt．A.goB.goingC.to goD.to going
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B解析介词后面要接动名词作宾语，故该题选B。但在介词but／except（除了）后要接不定式作宾语，当but／except前有行为动词do的各种形式时，后接不带to的不定式；如果没有动词do的各种形式，则接带to的不定式，例如：1）They have nothing to do but go to sleep．2）He has no choice but to wait．