C. Sleeping D. Having slept
(20) ______ the flies out, we had to shut all the doors and windows.
A. Keep B. To keep
C. Keeping D. Having kept
(21) ______ their service, the workers of the hotel are active in learning English.
A. Improving B. To improve
C. Improve D. Having improved
【是考查祈使句还是非谓语动词】相关文章:
最新
2016-11-24
2016-11-24
2016-11-09
2016-11-04
2016-11-04
2016-11-02