单项选择题

We haven’t really ____ a solution to the problem yet， which makes the boss really frustrated.

A．built up
B．fallen back on
C．brought over
D．come up with
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单项选择题
The new star said to the journalists that she ____ the opportunity to show that she could play a serious film role.
A．greeted
B．rejoiced
C．welcomed
D．cheered
单项选择题
What does the company announce that it can do for the United States
A．It can reduce the amount of plastic waste.
B．It can help to recycle the plastic waste.
C．It can increase the amount of exports.
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