单选题 It makes no difference to me _______ Mr. Smith will come or not.
【正确答案】 D
【答案解析】此题中whether用做连词，常与“or not”连用，意为“是否…”。例如：My sister is only seven，but she always tells me whether my pictures are good or not．(我妹妹才七岁，但她总能说出我画得好不好。)