单项选择题

______ English well, he translated the story without much difficulty.

A．Knowing
B．Knew
C．Known
D．To know
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单项选择题
______ this experiment is not difficult.
A．Having done
B．To do
C．Done
D．Being done
单项选择题
He acted ______ he didn't know what had happened.
A．since
B．even if
C．as
D．as if
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