2019年mpacc考试英语真题——副词171

{01}The highway through the rain forest was completed in 1990, _____ some animal species have died off. A.by when
B.since then
C.since when
D.by which time
解析：
本题选C。

{02}All the neighbours admired this family _____ the parents are treating their child like a friend. A.why
B.where
C.which
D.that
解析：
本题选B。