.What caused the accident and who was responsible for it____a mystery to us.
题目
.What caused the accident and who was responsible for it____a mystery to us.
A.remains B.remain C.is D.look like应选什么?为什莫?
答案
B 缺少谓语,主语是复数
举一反三
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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