As we came to the work site, the workers were seen _______the new house.
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A
building
B
build
C
built
D
to build
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 The machine has been made easier for it____.
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A
to operate
B
operated
C
being operated
D
to be operated
Having lost his key,________.
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A
he couldn’t enter the room
B
the gatekeeper offered to help
C
the door was forced open
D
the room couldn’t be entered