有头疽火陷证多发生在()
A.初起
B.1~2候
C.3候
D.4候
E.收口
参考答案:B
All his work___, he left his office at ease.
A.finished
B.hadbeenfinished
C.finishing
D.tofinish
1个钻孔施工完毕后,立即用电缆将钻机、钻杆拖拽至下一个钻孔位置。