There are still many problems to be solvedto be solved（solve）before we are ready for a long stay on the moon．
【考點(diǎn)】不定式的被動(dòng)式．
【答案】to be solved
【解答】
【點(diǎn)評(píng)】
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發(fā)布：2024/12/14 20:30:1組卷：143引用：18難度：0.6
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