单项选择题

My pain（）apparent the moment I walked into the room, for the first man I met asked sympathetically "Are you feeling all right"

A. must be
B. had been
C. must have been
D. had to be

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What animals swim from birth（）
单项选择题
The windmill, which has been used for hundreds of years to pump water and grind grains,（）redesigned to produce electricity.

A. it is now being
B. it now can
C. is now being
D. now being
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