33．The highway through the rain forest was completed in 1990, some animal species have die

发布时间：2020-08-16 07:33:26


33．The highway through the rain forest was pleted in 1990,     some animal species have died off.
A. by when
B. since then
C. since when
D. by which time

网友回答

A. by when
B. since then
(答案→)C. since when
D. by which time
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