问题补充：
Believe it or not, I am sure that is people call the sixth sense.
A. what
B. that
C. which
D. how
答案：
(答案→)A. what
B. that
C. which
D. how
解析： 考查表语从句。 people call the sixth sense是表语从句，且从句缺少call的宾语，所以选A。
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