问题
选择题
Three weeks having gone by, the cause of the accident _____ unknown to the public. [ ]
A. remains
B. is remaining
C. has remained
D. is remained
答案
答案：A
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Three weeks having gone by, the cause of the accident _____ unknown to the public. [ ]
A. remains
B. is remaining
C. has remained
D. is remained
答案：A