单项选择题

Mary wants to visit her uncle's. She ______ for the bus for two hours but it has not come yet.

A．has been waiting
B．is waiting
C．has waited
D．will be waiting
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单项选择题
He ______ his examination if he worked harder.
A．has passed
B．should have passed
C．could have passed
D．would have passed
单项选择题
Peter is my close friend and I know him well. He sleeps with the windows ______ every day.
A．close
B．to close
C．closing
D．closed
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