单项选择题

______ this experiment is not difficult.

A．Having done
B．To do
C．Done
D．Being done
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单项选择题
He acted ______ he didn't know what had happened.
A．since
B．even if
C．as
D．as if
单项选择题
His teacher demanded that his homework ______ on time.
A．is handed in
B．were handed in
C．was handed in
D．be; handed in
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