单项选择题

How the fire in the hotel started () a mystery.

A．remain
B．to remain
C．remains
D．is remaining

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单项选择题
41().

A．Mmost
B．Hardly
C．About
D．Nearly
单项选择题
At 13 he was sent to a shop, () he learned the business.

A．when
B．which
C．where
D．that
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