单项选择题

Look at John. He is sitting there ______ in deep thought.

A．being lost
B．lost
C．losing
D．having lost
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单项选择题
The noise of the door ______ made me unable to go to sleep.
A．opening and closing
B．opened and closed
C．being opened and closed
D．having been opened and closed
单项选择题
While discovering the cause of a disease, ______.
A．the best measures ought to be taken at once
B．the doctor should take the best measures
C．the disease should be treated right away
D．the patients should be properly treated
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