单项选择题

______ that the person he was looking for was not in, he went back.

A. To find
B. To have found
C. Find
D. Finding
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Solar cells have been developed primarily ______ electric power for spacecraft.
A. to provide
B. providing
C. to offer
D. to give
单项选择题
I think it my duty ______ your shortcomings.
A. to point out
B. to mention
C. to pick out
D. to remind of
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