单项选择题

When first ______ to the market, the toys didn't attract much attention.

A．introducing
B．introduced
C．was introduced
D．being introduced
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单项选择题
The president promised to keep all the board members ______ of how the negotiations were going on.
A．inform
B．informing
C．be informed
D．informed
单项选择题
When I went in, he was lying on the floor ______ at the ceiling.
A．to stare
B．stared
C．was staring
D．staring
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