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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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
单项选择题
Who is the man（）

A. Shop assistant.
B. Receptionist.
C. Hotel manager.
D. Clerk.
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