问题补充:
They’ve made full preparations, but it remains whether they will be able to do a good job in the experiment.
A. to see
B. seen
C. being seen
D. to be seen
答案:
A. to see
B. seen
C. being seen
(答案→)D. to be seen
解析:考查不定式的被动做表语:句意:他们已经做好准备了,但是是否在实验中能做得好还又待证实。It remains to be seen whether…,是否…还有待证实,这里不定式的被动做表语,选D。