单项选择题


A．means
B．ways
C．sources
D．resource
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单项选择题
A．primitiveB．importantC．impossibleD．outstanding
A．primitive
B．important
C．impossible
D．outstanding
单项选择题
A．happenedB．would happenC．happensD．happen
A．happened
B．would happen
C．happens
D．happen
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