单项选择题

______ is often the case, workers have overfulfilled their work program.

A. Which
B. It
C. That
D. As
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单项选择题
Cake ______ of flour, sugar, egg and some other ingredients.
A. contained
B. consists
C.includes
D. composed
单项选择题
When I was younger I ______ long distance, but now I'm out of practice.
A. was used to walk
B. got used to walk
C. was used to walking
D. used to walking
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