单项选择题

There ______ a pen，two pencils and three books on the desk．

A．are
B．is
C．has
D．have
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The manager or his secretary ______ to give you an interview.
A. is
B. are
C. was
D. were
单项选择题
Despite much research, there are still certain elements in the life cycle of the insect that ______ not fully understood.
A. are
B. were
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