问题
tern culture,21 was the age________ young people traditionallyreceived a key to their parents’ door, as a symbol of entering adulthood.
A:in which
B:on which
C:atwhich
D:to which
B:on which
C:atwhich
D:to which
正确答案是：
同类题型
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She got up early this morning _________ she could catch the first bus.
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