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The headmaster introduced ______ to the German visitors before the welcome party.

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are introduced    are been introduced    were introduced    had been introduced  
was introduced; to    was introducing; to    introduced; to    introduced; for  
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are introduced   have been introduced   were introduced   had been introduced  
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headmaster    a headmaster    the headmaster    of headmaster  
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a;a    the; the    a; the    the; a  
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to not play   not to play   not playing   not played  
the; the    a; a    a; the    the; a  
are introduced  have been introduced  were introduced  had been introduced  
introduced    has introduced    was introduced    is being introduced  

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