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Government cannot operate effectively ___________ it is free from such interference.
A.so long as
B.so that
C.unless
D.because
B.so that
C.unless
D.because
参考答案
参考解析
解析：考查连词辨析。句意为“除非政府摆脱这种干扰，否则就不能有效运作”。unless意为“除非；如果不”，相当于if…not，引导条件状语从句。其他三项，so long as“只要”，so that“因此；以至于；以便”， because“因为，由于”，均不符合题意。故选C。
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