问题
选择题
He doesn’t feel very tied after the heavy work, because he is used to ______ for hours without a rest.
A．work
B．working
C．works
D．worked
答案
答案：B
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He doesn’t feel very tied after the heavy work, because he is used to ______ for hours without a rest.
A．work
B．working
C．works
D．worked
答案：B
