-Must I send my uncle an e-mail now, Dad? -No, you ____.You____ do that after you finish your homework.
A.
couldn’t; may
B.
can’t; can
C.
needn’t; can
D.
may not; must
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举一反三
【单选题】Costs for regulation of business actually are a hidden tax severely reducing the competitiveness of domestic businesses ______ when they face an increasingly global marketplace.