单项选择题

Dina, （）for months to find a job as a waitress, finally took a position at a local advertising agency.

A. struggling
B. struggled
C. having struggled
D. to struggle

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单项选择题
Now everyone is concerned about how to conquer the economic crisis（）is very important for us to be able to preserve our standard of living.

A. which success
B. its success
C. the success of which
D. the success of it
单项选择题
Every means（）tried but without any result．

A．have been
B．is to be
C．are to be
D．has been
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