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 was in Indonesia, the UN officials believe, ______ the tsunami (海啸) caused the greatest damage.
A．where
B．which
C．when
D．that
单项选择题
______ seriously ill, you ought to go back to see her.
A．As your mother is
B．Your mother is
C．Being
D．Your mother being
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