两辆汽车在平直公路上运动,甲车内一同学看见乙车没有运动,而乙车内一同学看见路旁的树木向西移动。如果以地面为参考系,那么( ) A.甲车不动,乙车向东运动 B.乙车不动,甲车向东运动 C.甲车向西运动,乙车向东运动 D.甲、乙两车以相同的速度一起向东运动 答案:D I don’t really work here, I _____ until the new secretary arrives. A. just help out B. have just helped out C. am just helping out D. will just help out