单项选择题

A．would occur
B．have occurred
C．will occur’"
D．occurs
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单项选择题
A．affirmB．assertC．discoverD．declare
A．affirm
B．assert
C．discover
D．declare
单项选择题
A．travelB．travellingC．being travellingD．travelled
A．travel
B．travelling
C．being travelling
D．travelled
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