单项选择题


A．do
B．did
C．are
D．were
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单项选择题
A．throughB．byC．inD．across
A．through
B．by
C．in
D．across
单项选择题
A．happenedB．would happenC．happensD．happen
A．happened
B．would happen
C．happens
D．happen
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