单项选择题

I was very sleepy. I tried ______ my eyes open but I couldn't.

A．keeping
B．having kept
C．to have kept
D．to keep
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单项选择题
It is requested that all the managers ______ present at the meeting tomorrow.
A．were
B．will be
C．are
D．be
单项选择题
We are having our dinner ______ suddenly someone knocked the door.
A．when
B．before
C．while
D．as
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