单选题 I have no idea what Mary ______ at this time tomorrow.
A.will be doing B.is doing C.will do D.does

【正确答案】 A
【答案解析】[解析] 本题为动词时态题,测试的是将来进行时的用法。根据句中时间状语at this time tomorrow,可知本题答案为选项A。