单项选择题

Painting in oil is harder than______.

A．water colours
B．in water colours
C．paint in water colours
D．painting in water colours
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单项选择题
Airplanes have made______.
A．easy and comfortable for us to travel
B．us to travel easily and comfortably
C．it easy and comfortable for us to travel
D．themselves easy and comfortable for us to travel
单项选择题
The teacher, with 6 girls and 8 boys of her class,______ visiting a museum when the earthquake struck.
A．was
B．were
C．had been
D．would be
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