They’ve made full preparations, but it remains ______whether they will be able to do a good job in the experiment.
A．to seeB．seenC．being seenD．to be seen
D

試題分析：考查不定式的被動做表語：句意：他們已經(jīng)做好準備了，但是是否在實驗中能做得好還又待證實。It remains to be seen whether…，是否…還有待證實，這里不定式的被動做表語，選D。
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