问题

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
B: to be operating
C: operated
D: to operate
正确答案是:
同类题型
She __________ an English teacher, but now she is a businesswoman .
In the old days he work day and night to make a living.
The song “trouble is friend” is worth _______________________.
matters most is they can finish the task on time.
I don’t think Tom’s remarks are _____; he is not supposed to say so[ ]