—Why do you look so tired?

—I ________ a day off since last month. [ ]

A. didn't put  

B. didn't get

C. haven't had  

D. hadn't taken

小明在匀速且沿直线前进的火车车厢里用手竖直向上抛出一玻璃小球，小球将下落到：（忽略空气阻力）[ ]

A.小明的前方

B.小明后方

C.小明的手上

D.以上三种情况都有可能