______ to somebody , a British person often shakes hands with the stranger . 
#98543
A
Introducing
B
To introduce
C
To be introduced
D
On being introduced
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Upon ________ his studies, he started travelling in China. 
#90548
A
finish
B
finishing
C
he finished
D
finished
Nobody but doctors or nurses and those ________ by Dr Li ________ to enter the patient’s room.
#88751
A
being invited;allowed
B
are invited;are allowed
C
invited;is allowed
D
invited;are allowed