列车上交下需抢救的旅客，需后补证明材料时，在（）内补送处理站
A.2日
B.4日
C.3日
参考答案：C
—The boss said we had only three days to finish the work.
—Don't worry.We have already________two thirds of it.[ ]
A. got down
B. got through
C. given in
D. given away
密封油真空油箱的油位是如何调节的？
