This machine is very easy _______. Anybody can learn to use it in a few minutes. 
#90906
A
operating
B
to be operating
C
operated
D
to operate
推荐题目
The murderer was brought in, with his hands _____ behind his back. 
#98281
A
being tied
B
having tied
C
to be tied
D
tied
Tom took a taxi to the airport, only ________ his plane high up in the sky.
#94209
A
finding
B
to find
C
being found
D
to have found
This is the second time that I__________ the same mistake.
#91792
A
making
B
make
C
have made
D
to make