单项选择题

Anew collection of programs______in the conference room.

A． are presenting
B． are presented
C． present
D． is being presented
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单项选择题
Some managers wouldn't let the assistants ______ early yesterday.
A． leave
B． leaves
C． leaving
D． left
单项选择题
The company appreciates not only the president's ambition______ his ideas.
A． or
B． but also
C． with
D． and if
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