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 pro duce electricity.
A．it is now being
B．it now can
C．is now being
D．now being
单项选择题
______ that they may eventually reduce the amount of labor needed on construction sites by around 90 percent.
A．So clever are the construction robots
B．So clever the construction robots are
C．Such construction robots are clever
D．Such clever construction robots are
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