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40. First, you saw a carpenter on the ground with materials for roofing. After a while.
you saw him on the rooftop fixing the roof. What could he have done?
A. He used a big rope to climb the rooftop.
B. He used a pulley to climb and lift the materials.
C. He used a long lever to climb the rooftop and lift the materials.
D. He used a ladder to climb the roof top and a pulley to lift the roofing materials.​