单选题
The day I shall never forget is the one ______ I joined the Party.
A、
which
B、
on which
C、
at which
D、
in which
【正确答案】
B
【答案解析】
[解析] 先行词the one在定语从句中作时间状语，因此定语从句用on which=when引导。
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