The idea they have come up with sounds great, but it remainswhether it works well in pract

发布时间：2020-08-16 20:32:36

The idea they have e up with sounds great, but it remains      whether it works well in practice．
A. to see
B. to be seen
C. seeing
D. seen

网友回答

A. to see
(答案→)B. to be seen
C. seeing
D. seen
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