单项选择题

A．However
B．And
C．Therefore
D．So
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Candles were sometimes used, but often caused devastaring fires, and many different types of candle holders were invented to try to prevent tree fires.
单项选择题
A．offeringB．offeredC．which offeredD．to be offered
A．offering
B．offered
C．which offered
D．to be offered
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