单项选择题

How the fire in the dancing hall started______a mystery.

[A] to remain
[B] remains
[C] remain
[D] is remaining
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单项选择题
______everything means to know nothing.
[A] To know
[B] Knowing
[C] One knows
[D] You know
单项选择题
-Can I help you -I'd like to have a______of China Daily.
[A] piece
[B] sheet
[C] loaf
[D] copy
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