题目内容
16．What caused the accident remainsunknown．We need to do more research on it．（know）分析 造成事故的原因尚不清楚，我们需要做更多的调查．
解答 答案：unknown．
根据题干What caused the accident remains___，so we need to do more research on it．（know） 可知句意为：造成事故的原因尚不清楚，我们需要做更多的调查．remain（连系动词）+形容词，作表语．表示某种状态或情况．unknown，未知的，形容词．故填：unknown．
点评 本题考查用所给单词的适当形式填空，首先要根据语境明确句意，然后再根据相关语法对所给单词在形式上做出正确的变化．
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