29. This machine is very easy . Anybody can learn to use it in a few minutes.(A)operating (B) to be

問題詳情

29. 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

答案：D
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)