单项选择题

" We're late and the play has started." "I wonder how long ago ______."

A．did it begin
B．it began
C．was it beginning
D．it has begun
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单项选择题
The boys and girls ______ together round the camp fire telling stories and singing songs.
A．reversed
B．clapped
C．clustered
D．contracted
单项选择题
The new edition of the encyclopedia ______ many improvements, which is the result of the persistent effort of all the compilers.
A．embedded
B．embodied
C．enchanted
D．enclosed
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