What caused the accident and who was responsible for it ________ a mystery.[ ]A. has remained B. are remained C. remainsD. remain-高中英语-n多题

◎ 题干

What caused the accident and who was responsible for it ________ a mystery.

[ ]

A. has remained
B. are remained
C. remains
D. remain

◎ 答案

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◎ 解析

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◎ 知识点

根据n多题专家分析，试题“What caused the accident and who was responsible for it ________ a mystery.[ ]A. has remained B. are remained C. remainsD. remain…”主要考查了你对【一般现在时】，【主谓一致】等知识点的理解和应用能力。关于这些知识点的“档案”，你可以点击相应的链接进行查看和学习。

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与“What caused the accident and who was responsible for it ________ a mystery.[ ]A. has remained B. are remained C. remainsD. remain”考查相似的试题有：

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