单项选择题

The greatest invention of the 20^th century is ______ computer.

A．/
B．the
C．a
D．an

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单项选择题

Shopaholics just cannot stop themselves ______ things.

A．to buy
B．buy
C．buying
D．bought

单项选择题

Are you ______ with your present salary7

A．satisfying
B．glad
C．happy
D．content

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