单项选择题

We found it impossible（）all the questions within the time given.

A、solve
B、being solving
C、to have solved
D、to solve

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单项选择题
（）cared about our sufferings like you.

A、Never before anyone has
B、Has anyone never before
C、Before has anyone never
D、Never before has anyone
单项选择题
Scientists should be kept（）of the latest developments in their research areas.

A. inform
B. informing
C. informed
D. to inform
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