单项选择题

He ______ an old friend in the street the other day.

A．came about
B．came across
C．came from
D．came into
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单项选择题
After her time in hospital, Jenny's parents are afraid she has ______ in her lessons.
A．fallen behind
B．fallen down
C．fallen back
D．fallen off
单项选择题
Sports and games can be ______ great help to us.
A．of
B．at
C．on
D．in
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