单项选择题

The Healthcare community was shocked （） Ricardo Peter's resignation after only one year as president of Heahhcorps.

A. in
B. up
C. of
D. by

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单项选择题
It's difficult （） this work today.

A. to finish
B. finish
C. finishing
D. finished
单项选择题
A spokesperson for Solaris International announced that the company would （） on strengthening investor relations in South Americ

a.A. repeat
B. surpass
C. franchise
D. concertrate
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