单项选择题

Nobody but doctors or nurses and those ______ by Dr. Hu ______ to enter the patient's room.

A．invited; is allowed
B．are invited; are allowed
C．being invited; allowed
D．invited; are allowed
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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
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
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