________ many times，I still didn't know how to operate the machine.
#91844
A
Having taught
B
Having been taught
C
Being taught
D
Teaching
推荐题目
She couldn't wait ________ home after such a long and tiring journey.
#88589
A
going
B
to go
C
go
D
went
The boss suggested _________ a meeting and it suggested that he _________ in our plan.
#88362
A
to hold; was interested
B
holding; was interested
C
holding; should be interested
D
should hold; be interested
HuShuli, __________ editor of China’s most influential business publication, Caijing, has resigned from the biweekly.
#98546
A
founding
B
founded
C
found
D
having found
There are still many problems ______ before we are ready for a long stay on the Moon.
#88396
A
solving
B
solved
C
being solved
D
to be solved
He found them _____ at a table ____ chess.
#93983
A
sat; to play
B
sitting; to play
C
seated; playing
D
seat; playing