. the dinosaurs disappeared still remains a mystery.A. whetherB. thatC. ifD. Why

发布时间：2020-08-16 11:06:50


.      the dinosaurs disappeared still remains a mystery.
A. whether
B. that
C. if
D. Why

网友回答

A. whether
B. that
C. if
(答案→)D. Why
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