单项选择题

"Hope for the best and prepare for the worst. " is a proverb, ______ life is beautiful and full of frustrations (挫折) as well.

A．means
B．to mean
C．meaning
D．meant
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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
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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