____ several times, the young scientist still kept on doing his experiments.
#92897
A
Having failed
B
Having been failed
C
Failed
D
To fail
推荐题目
If you have any difficulty ____ how to skate, you can turn to Jacky.
#92712
A
learned
B
to learn
C
learning
D
learn
We saw new houses_____wherever we went on our visit.
#98215
A
built
B
being built
C
building
D
to build
She let the children ______ to play instead of staying at home all the time.
#96315
A
going out
B
went out
C
to go out
D
go out
To finish the homework, he spent four hours _______ in the study.
#97225
A
locking
B
locked
C
locked himself
D
to lock
When I entered the room, I found a little boy _____ on his mother’s knees _____ to draw a picture.
#94504
A
seated; learning
B
sitting; to learn
C
seating; learning
D
sat; was learning