单项选择题

O'Neal works hard. He is often seen ______ heavily before his teammates start.

A．sweated
B．to he sweated
C．sweating
D．being sweated
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单项选择题
Tony was very unhappy for ______ to the party.
A．having not been invited
B．not having invited
C．having not invited
D．not having been invited
单项选择题
Some words are hard to ______ because they have many different uses.
A．express
B．explain
C．define
D．describe
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