单项选择题


A．don't need begin
B．needn't to begin
C．need not to begin
D．needn't begin
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单项选择题
A．investigationsB．bidsC．inquiriesD．surveys
A．investigations
B．bids
C．inquiries
D．surveys
单项选择题
A．varyB．variesC．differentD．' differs
A．vary
B．varies
C．different
D．' differs
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