单项选择题

It was in 1939（）the World War Ⅱ broke out.

A、 when
B、 in which
C、 which
D、 that

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He didn't（）in the party last night.

A、 show off
B、 show in
C、 show up
D、 show around
单项选择题
It is you（）to blame.

A、 that is
B、 who is
C、 which are
D、 who are
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