单选题 The college offers so many courses; the students haven't decided ______.
A．where to choose B．whom to choose C．which to choose D．why to choose

【正确答案】 C
【答案解析】[解析] 在选项的四个疑问代词中，只有which指代物。前半句讲的是课程，所以，C为正确选项。