I remembered ________ the door before I left the office, but forgot to turn off
题型：专项题难度：来源：
| I remembered ________ the door before I left the office, but forgot to turn off the lights. |
| [ ] |
A. locking
B. to lock
C. having locked
D. to have locked |
答案
| B |
举一反三
| Birds" singing is sometimes a warning to other birds ________ away. |
| [ ] |
A. to stay
B. staying
C. stayed
D. stay |
| This machine is very easy ________. Anybody can learn to use it in a few minutes. |
| [ ] |
A. operating
B. to be operating
C. operated
D. to operate |
| The old man sat in front of the television every evening, happy ________ anything that happened to be on. |
| [ ] |
A. to watch
B. watching
C. watched
D. to have watched |
| If he takes on this work, he will have no choice but ________ an even greater challenge. |
| [ ] |
A. meets
B. meeting
C. meet
D. to meet |
| As Jack left his membership card at home, he wasn"t allowed ________ into the sports club. |
| [ ] |
A. going
B. to go
C. go
D. gone |
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